CN102610093A - Method for arranging special left-turning lane for separating type truck - Google Patents

Abstract

The invention belongs to the technical field of intersection canalization design. In order to make up the blank of the research field of a special left-turning lane for a truck and provide a basis for arranging the special left-turning lane for the truck at intersection, the invention adopts the technical scheme that a method for arranging the special left-turning lane for a separating type truck comprises the following steps of: (1) judging if arranging the special left-turning lane for the truck according to the calculation for a critical condition for arranging the special left-turning lane for the truck; (2) analyzing a right arranging condition for the special left-turning lane for the truck; (3) analyzing an auxiliary condition for a separating type left-turning lane; and (4) performing intersection signal timing on the special left-turning lane for the separating type truck. The method provided by the invention is mainly applied to the intersection canalization design.

Description

Separate type lorry exclusive left-turn lane method to set up

Technical field

The invention belongs to level-crossing canalization design field, the separate type lorry exclusive left-turn lane method to set up of signalized crossing specifically, relates to separate type lorry exclusive left-turn lane method to set up.

Background technology

Level-crossing to urban periphal defence belt road and urban road; The belt road is the main thoroughfare that lorry gets into highway; Turn left to enter on the belt road and have a large amount of lorries on the arterial street, wherein the lorry type mainly comprises high capacity waggon, container car, towed vehicle etc.Lorry is compared characteristics such as having volume is big, the speed of a motor vehicle is low, mobility difference with minibus.Along with the lorry ratio increases the interference aggravation between passenger-cargo vehicle, will inevitably greatly influence the left-hand rotation release efficiency of crossing under passenger-cargo mixed market condition.Simultaneously, because lorry left-hands rotation needs bigger radius of turn, and the most inboard traditional left turn lane is provided with form and possibly causes lorry radius of turn deficiency, thereby has limited release efficiency.

In order to reduce the interference that passenger-cargo mixed market condition produces; Can be through the interference that separate type lorry exclusive left-turn lane reduces passenger-cargo mixed row be set; Be about to original two left turn lanes separately, at the arranged outside lorry exclusive left-turn lane of crossing, this way had both been eliminated the phase mutual interference between left-hand rotation passenger vehicle and the left-hand rotation lorry; Simultaneously suitably increase the radius of turn of left-hand rotation lorry, thereby improved the release efficiency of vehicle.From present research situation; Still nobody carried out research to separate type lorry exclusive left-turn lane method to set up; Also not relevant canalization method for designing in the actual engineering, so the present invention has set up the lorry exclusive left-turn lane condition model is set through going deep into theoretical analysis and research; And the lorry exclusive left-turn lane right side puts condition analysis, thereby obtains definite method that a simple maneuverable separate type lorry exclusive left-turn lane is provided with.

Summary of the invention

The present invention is intended to solve the deficiency that overcomes prior art, remedies the blank of unitrain left turn lane research field, for the setting of level-crossing lorry exclusive left-turn lane provides foundation.For achieving the above object, the technical scheme that the present invention takes is that separate type lorry exclusive left-turn lane method to set up comprises the following steps:

(1) calculating that according to the lorry exclusive left-turn lane critical condition is set judges whether to be provided with the lorry exclusive left-turn lane:

When satisfying inequality

The lorry exclusive left-turn lane is set when concerning, otherwise then the lorry exclusive left-turn lane is not set; Wherein: mix trade road comprehensive correction factor

Calculating formula is:

For corresponding lorry in radius r ₁, r ₂, r ₃, lorry ratio p ₁, p ₂, p ₃Lorry correction factor under the condition;

Lorry special lane comprehensive correction factor calculating formula is: ${\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}=\frac{{\mathrm{\&epsiv;}}_1^{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_1,100\%}\&times;{\mathrm{\&eta;}}_1+{\mathrm{\&epsiv;}}_2^{r_2,100\%}\&times;{\mathrm{\&eta;}}_2+{\mathrm{\&epsiv;}}_3^{r_3,100\%}\&times;{\mathrm{\&eta;}}_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{\mathrm{\&eta;}}_k},$

For corresponding lorry in radius r ₁, r ₂, r ₃, the correction factor under lorry ratio 100% condition;

(2) analyze the lorry exclusive left-turn lane right side and put condition:

Calculate the right side and put critical condition, differentiate whether put on the lorry exclusive left-turn lane right side: the critical condition that put on the lorry exclusive left-turn lane right side be satisfy between the subtend lorry exclusive left-turn lane lorry operation curve distance

wherein

be minimum safe distance; Δ d is a minor increment between the subtend lorry exclusive left-turn lane lorry operation curve; Is minimum safe distance with the vehicle ' lateral clearance apart from δ, and calculating formula is as follows:

δ=0.7+0.02 (v ₁+ v ₂); Wherein, v ₁, v ₂For this to, opposed vehicle operating speed;

Suppose that subtend entrance driveway track, crossing is provided with form and has symmetry, i.e. v ₁=v ₂Be reduced to:

δ=0.7+0.04v; Wherein, v is left-hand rotation lorry operation average speed;

Crossing radius of turn r and turning operating speed v relational expression are:

wherein,

is the type of vehicle coefficient; α is the turning road grade; crossing planar horizontal α=0 when type of vehicle is large car; Have so: $d_s^{\min }=\mathrm{\&delta;}=0.7+0.04\sqrt{r\&times;19.5};$

(3) analyze separate type left turn lane subsidiary conditions:

The lorry left turn lane that put on the right side is not provided with curved area to be transferred, a left side, still keeps curved area to be transferred, an original left side for the not right lorry exclusive left-turn lane of putting;

(4) the intersection signal timing of separate type lorry exclusive left-turn lane:

1. ",, the traffic conflict of separate type left turn lane analyzes

Green light for i-1 and i phasetophase and i and i+1 phasetophase need meet the following conditions interval time, and wherein the i phase place is this phase place, i.e. the separate type left turn phase:

I, i-1 and i phasetophase green light interval time

For satisfying condition of i-1 and i phasetophase green light interval time; If interior survey left turn lane vehicle and opposite through vehicles conflict point are conflict point 71; The outside left turn lane vehicle and opposite through vehicles conflict point are conflict point 72, and keep straight on latter stage of i-1 phase place green light is respectively time of last bus arrival conflict point 71,72

The time that i phase place green light initial stage left-hand rotation first bus arrives conflict point 71,72 is respectively

Only need to satisfy:

Wherein, t _sBe the personal distance time, unit second, Be the green light interval time of i-1 phase place and i phasetophase under the separate type condition, unit second;

II, i and i+1 phasetophase green light interval time

For satisfying condition of i and i+1 phasetophase green light interval time; Outside left turn lane vehicle is a conflict point 1 with through vehicles conflict point from right to left; Inboard left turn lane vehicle is a conflict point 2 with through vehicles conflict point from right to left; Inboard left turn lane vehicle is a conflict point 3 with through vehicles conflict point from left to right; Outside left turn lane vehicle is a conflict point 4 with through vehicles conflict point from left to right, and turn left latter stage of i phase place green light is respectively time that

i+1 phase place green light initial stage craspedodrome first bus arrives conflict point 1,2,3,4 and is respectively

and only needs to satisfy time that last bus arrives conflict point 1,2,3,4: $\left\{\begin{array}{c}{t}_1^{i+1}+I_1^{i,i+1}\&GreaterEqual;t_1^i\left(\mathrm{outer}\right)+t_s\\ t_3^{i+1}+I_2^{i,i+1}\&GreaterEqual;t_3^i\left(\mathrm{inner}\right)+t_s\end{array}\right.;$ The green light of i phase place and i+1 phasetophase is

interval time so wherein; is green light chosen candidate value interval time that the left side straightgoing vehicle conflicts with the left-hand rotation car,

be green light chosen candidate value interval time that the right side straightgoing vehicle conflicts with the left-hand rotation car;

2., intersection signal timing

Signal total losses time L under the condition of special-purpose passenger-cargo track _tCalculating formula is:

Wherein, L _sBe lost time at green light initial stage, unit second;

Be the green light interval time of i phase place and i+1 phasetophase, unit second; A is the amber light duration, unit second; I is a number of phases;

Optimum signal cycle C under the unitrain left turn lane condition _T0Calculating formula is:

Y wherein _tFor each phase place maximum flow compares sum.

As follows to the computing method of each quasi-representative lorry correction factor respectively to different radiuss of turn with mixed row ratio condition:

I, when

The time, can obtain the correction factor of respective type lorry through question blank 1, table 2 and table 3; , table 1 is the high capacity waggon saturation flow rate adjustment factor; Table 2 is the container car saturation flow rate adjustment factor; Table 3 is the towed vehicle saturation flow rate adjustment factor; Wherein, r _kRadius of turn for k class lorry under the actual conditions;

Be i radius in the k class lorry correction factor table,

p _kFor k class left-hand rotation lorry under the actual conditions accounts for the total ratio of left turning vehicle, be called for short the row ratio of mixing;

Be j in the k class lorry correction factor table mixed row ratio,

Table 1 high capacity waggon saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9375	0.9279	0.9279	0.9267	0.9220	0.9271	0.9417
								20％	0.8586	0.8758	0.8667	0.8712	0.8550	0.8710	0.8787
30％	0.8304	0.8315	0.8072	0.8301	0.8227	0.8289	0.8374
								40％	0.7634	0.7871	0.7676	0.7874	0.7734	0.7854	0.8028
50％	0.7247	0.7273	0.7252	0.7480	0.7366	0.7496	0.7615
								60％	0.6905	0.7073	0.6910	0.7077	0.7005	0.7104	0.7236
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9348	0.9398	0.9307	0.9442	0.9397	0.9319	0.9324
								20％	0.8871	0.8935	0.8841	0.8921	0.8883	0.8831	0.8827
30％	0.8441	0.8427	0.8443	0.8526	0.8548	0.8441	0.8440
								40％	0.8108	0.8072	0.8007	0.8096	0.8088	0.8045	0.8157
50％	0.7658	0.7698	0.7603	0.7762	0.7658	0.7737	0.7707
								60％	0.7345	0.7356	0.7247	0.7338	0.7336	0.7301	0.7383

Table 2 container car saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9107	0.9268	0.9008	0.9155	0.9184	0.9228	0.9194
								20％	0.8408	0.8614	0.8365	0.8615	0.8463	0.8525	0.8664
30％	0.8006	0.7949	0.7864	0.8019	0.8015	0.8174	0.8113
								40％	0.7336	0.7616	0.7337	0.7585	0.7515	0.7619	0.7737
50％	0.6920	0.7129	0.6953	0.7109	0.7059	0.7170	0.7327
								60％	0.6458	0.6696	0.6470	0.6812	0.6684	0.6819	0.6924
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9250	0.9352	0.9242	0.9214	0.9309	0.9272	0.9304
								20％	0.8669	0.8774	0.8668	0.8736	0.8775	0.8654	0.8783
30％	0.8258	0.8272	0.8200	0.8265	0.8408	0.8252	0.8354
								40％	0.7782	0.7910	0.7793	0.7836	0.7916	0.7867	0.7884
50％	0.7423	0.7408	0.7423	0.7467	0.7532	0.7500	0.7414
								60％	0.7012	0.7058	0.6973	0.7001	0.7117	0.6987	0.7090

Table 3 towed vehicle saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.8735	0.9002	0.8731	0.8905	0.8846	0.8912	0.8932
								20％	0.8095	0.8071	0.7846	0.8052	0.7897	0.8125	0.8146
30％	0.7262	0.7550	0.7221	0.7391	0.7426	0.7423	0.7468
								40％	0.6607	0.6851	0.6640	0.6916	0.6743	0.6798	0.6917
50％	0.6116	0.6208	0.6113	0.6353	0.6221	0.6341	0.6447
								60％	0.5699	0.5854	0.5559	0.5918	0.5809	0.6004	0.5923
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9022	0.8977	0.8970	0.8948	0.9051	0.9056	0.9049
								20％	0.8167	0.8253	0.8107	0.8253	0.8312	0.8234	0.8336
30％	0.7580	0.7630	0.7546	0.7557	0.7718	0.7698	0.7768
								40％	0.7032	0.7097	0.7035	0.7056	0.7165	0.7104	0.7177
50％	0.6491	0.6531	0.6535	0.6554	0.6625	0.6620	0.6684
								60％	0.6040	0.6093	0.6067	0.6094	0.6174	0.6200	0.6197

II, when

, calculating formula is: ${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k^i,p_k}=p_k^{*}\&times;({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}});$ Wherein,

is that k class lorry mixes row ratio relative coefficient; Promptly

is the correction factor of k class lorry under i radius, a j mixed row ratio condition, be the correction factor of k class lorry under i radius, a j+1 mixed row ratio condition;

III, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k,p_k^j}=r_k^{*}\&times;\left(\right|{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}|+\min \{{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j},{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}\left\}\right);$ Wherein,

is the radius relative coefficient of k class lorry; Promptly

is the correction factor of k class lorry under i radius, a j mixed row ratio condition, be the correction factor of k class lorry under i+1 radius, a j mixed row ratio condition;

IV, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}=p_k^{*}\&times;r_k^{*}\&times;\left[\begin{array}{c}|({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}})-({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})|\\ +\min \{({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}}),({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})\}\end{array}\right].$

The geometric locus distance computation method of minimum safe distance:

If AC and BD are the crossing, the width of B, D mouth is l ₁, the width of A, C mouth is l ₂With crossing B entrance driveway is example, and left turn lane 2 is the lorry exclusive left-turn lane, and its inlet radius is y ₁, going out port radius is x ₁, the lorry mean radius of turning left so

Because crossing subtend entrance driveway has symmetry, the mean radius that the subtend lorry turns left also is d ₁

According to geometric relationship, the known d that works as ₁When being on the same straight line with Δ d and Δ l, distance is minimum between the subtend lorry exclusive left-turn lane lorry operation curve, and wherein Δ l is a crossing rectangle diagonal distance; Minor increment is calculated by formula between the subtend lorry exclusive left-turn lane lorry operation curve so:

Technical characterstic of the present invention and effect:

1, the present invention proposes the novel canalization form of separate type lorry exclusive left-turn lane; Both eliminated the phase mutual interference between left-hand rotation passenger vehicle and the left-hand rotation lorry; Suitably increased simultaneously the radius of turn of left-hand rotation lorry; Thereby improved the release efficiency of vehicle, specifically obtained the lorry exclusive left-turn lane condition is set, and utilized emulation experiment to obtain typical types lorry saturation flow rate adjustment factor through theoretical analysis; Set up the lorry exclusive left-turn lane critical condition model has been set, and provided the computing method that the lorry exclusive left-turn lane is provided with condition;

2, the present invention provides the condition that is provided with that put on the lorry exclusive left-turn lane right side through the right side being put superiority condition and right in-depth analysis of putting critical condition;

3, the present invention has designed lorry exclusive left-turn lane sign, and points out that the left turn lane right side is put curved area to be transferred, a left side will be set under the situation, and the right side is not put and kept curved area to be transferred, an original left side under the situation;

4, the present invention provides the intersection signal timing method that adapts under the separate type lorry exclusive left-turn lane condition simultaneously, so that the special-purpose Through Lane control of lorry effect reaches optimum.

Description of drawings

Fig. 1: original left turn lane is provided with form and passage mode.11,12 tracks are passenger-cargo mixed capable left turn lane.

Fig. 2: the novel wagon exclusive left-turn lane is provided with form and passage mode.21 tracks are passenger vehicle left-hand rotation dedicated Lanes, and 22 tracks are lorry left-hand rotation dedicated Lanes.

Fig. 3: the lorry saturation volume rate is with the radius of turn change curve.

Fig. 4: situation is put on the lorry exclusive left-turn lane right side how much.Separate type lorry exclusive left-turn lane passage mode.

Fig. 5: the optimum position synoptic diagram is put on the left turn lane right side.Separate type lorry dedicated Lanes passage mode.

Fig. 6: lorry exclusive left-turn lane sign.

Fig. 7: two left-hand rotation i 1 phase places of separate type and i phase conflicts are analyzed.I 1 phase place green light straightgoing vehicle in latter stage last bus conflicts with i phase place green light initial stage left-hand rotation first bus.

Fig. 8: two left-hand rotation i phase places of separate type and i+1 phase conflicts are analyzed.The i phase place green light last bus that turns left latter stage conflicts with i+1 phase place green light initial stage craspedodrome first bus.

Embodiment

To the level-crossing of urban periphal defence belt road and urban road, the belt road is the main thoroughfare that lorry gets into highway, just has a large amount of lorries so on the arterial street and turns left to enter into the belt road.The operational efficiency of crossing depends on the saturation volume rate that vehicle discharges; Lorry is compared characteristics such as having volume is big, the speed of a motor vehicle is low, mobility difference with minibus.Along with the lorry ratio increases the interference aggravation between passenger-cargo vehicle, will inevitably greatly influence the left-hand rotation release efficiency of crossing under passenger-cargo mixed market condition.The present invention considers to increase left-hand rotation lorry radius of turn through the interference that the lorry exclusive left-turn lane reduces passenger-cargo mixed row is set, to guarantee to turn left efficiently release efficiency.One aspect of the present invention obtains the lorry exclusive left-turn lane through theoretical analysis condition is set; And utilize emulation experiment to obtain typical types lorry saturation flow rate adjustment factor; Set up the lorry exclusive left-turn lane critical condition model has been set, and provided the computing method that the lorry exclusive left-turn lane is provided with condition; Put the critical condition analysis through the right side being put the superiority condition and the right side on the other hand, provide the condition that is provided with that put on the lorry exclusive left-turn lane right side; Provide the signal time distributing conception that adapts to separate type unitrain left turn lane at last.This design can remedy the blank of lorry exclusive left-turn lane design field, optimizes canalization design of special crossing and signal timing dial.

The objective of the invention is to overcome the deficiency in the existing level-crossing canalization design, propose the method for designing that a kind of separate type lorry exclusive left-turn lane is provided with, the scheme of the present invention's employing is following for this reason:

Separate type lorry exclusive left-turn lane is provided with definite method, comprises following content:

(1) separate type lorry exclusive left-turn lane is provided with form analysis:

Original left turn lane passage mode is passenger-cargoly to mix the crossing of working, and large car needs turn left from the entrance driveway leftmost side, and is as shown in Figure 1; Novel left turn lane passage mode is that separate type left turn lane group is separated and be provided with to passenger vehicle, lorry, and it is separated through the crossing fully, and satisfies the left-hand rotation radius of lorry, and is as shown in Figure 2.

(2) the lorry exclusive left-turn lane is provided with condition analysis:

1, the lorry exclusive left-turn lane is provided with critical condition

The lorry exclusive left-turn lane is provided with critical condition:

wherein,

is for mixing the saturation volume rate of runway under radius r, mixed row ratio p condition;

is the saturation volume rates of minibus dedicated Lanes under the radius r condition;

is the saturation volume rates of lorry dedicated Lanes under the radius r condition;

Each quasi-representative truck vehicle number accounts for total left turning vehicle ratio of counting and is respectively p ₁, p ₂, p ₃Account for left-hand rotation truck vehicle sum ratio and be respectively η ₁, η ₂, η ₃Two kinds of proportionate relationships do

K=1 wherein, 2,3 (1 represents high capacity waggon, and 2 represent container car, and 3 represent towed vehicle, wherein about the long 10m of high capacity waggon vehicle body, about the long 14m of container car vehicle body, about the long 1gm of towed vehicle vehicle body); P is the ratio that left-hand rotation lorry total amount accounts for the left turning vehicle sum;

Mixing trade road comprehensive correction factor calculating formula is: $\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}=\frac{{\mathrm{\&epsiv;}}_1^{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_1,{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_1}\&times;{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_1+{\mathrm{\&epsiv;}}_2^{r_2,p_2}\&times;p_2+{\mathrm{\&epsiv;}}_3^{r_3,p_3}\&times;p_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{p}_k};$ Wherein,

For lorry in radius r ₁(r ₂, r ₃), lorry ratio p ₁(p ₂, p ₃) correction factor under the condition;

Lorry special lane comprehensive correction factor

calculating formula is: ${\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}=\frac{{\mathrm{\&epsiv;}}_1^{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_1,100\%}\&times;{\mathrm{\&eta;}}_1+{\mathrm{\&epsiv;}}_2^{r_2,100\%}\&times;{\mathrm{\&eta;}}_2+{\mathrm{\&epsiv;}}_3^{r_3,100\%}\&times;{\mathrm{\&eta;}}_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{\mathrm{\&eta;}}_k};$ Wherein,

For lorry in radius r ₁(r ₂, r ₃), the correction factor under lorry ratio 100% condition;

Each correction factor substitution is got:

owing to cancellation

abbreviation is:

is provided with the lorry exclusive left-turn lane when satisfying inequality relation, otherwise then the lorry exclusive left-turn lane is not set.

2, typical types lorry correction factor

The correction factor of the different radius of turn different blended of each quasi-representative lorry row ratio:

Table 4 high capacity waggon saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9375	0.9279	0.9279	0.9267	0.9220	0.9271	0.9417
								20％	0.8586	0.8758	0.8667	0.8712	0.8550	0.8710	0.8787
30％	0.8304	0.8315	0.8072	0.8301	0.8227	0.8289	0.8374
								40％	0.7634	0.7871	0.7676	0.7874	0.7734	0.7854	0.8028
50％	0.7247	0.7273	0.7252	0.7480	0.7366	0.7496	0.7615
								60％	0.6905	0.7073	0.6910	0.7077	0.7005	0.7104	0.7236
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9348	0.9398	0.9307	0.9442	0.9397	0.9319	0.9324
								20％	0.8871	0.8935	0.8841	0.8921	0.8883	0.8831	0.8827
30％	0.8441	0.8427	0.8443	0.8526	0.8548	0.8441	0.8440
								40％	0.8108	0.8072	0.8007	0.8096	0.8088	0.8045	0.8157

50％	0.7658	0.7698	0.7603	0.7762	0.7658	0.7737	0.7707
								60％	0.7345	0.7356	0.7247	0.7338	0.7336	0.7301	0.7383

Table 5 container car saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9107	0.9268	0.9008	0.9155	0.9184	0.9228	0.9194
								20％	0.8408	0.8614	0.8365	0.8615	0.8463	0.8525	0.8664
30％	0.8006	0.7949	0.7864	0.8019	0.8015	0.8174	0.8113
								40％	0.7336	0.7616	0.7337	0.7585	0.7515	0.7619	0.7737
50％	0.6920	0.7129	0.6953	0.7109	0.7059	0.7170	0.7327
								60％	0.6458	0.6696	0.6470	0.6812	0.6684	0.6819	0.6924
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9250	0.9352	0.9242	0.9214	0.9309	0.9272	0.9304
								20％	0.8669	0.8774	0.8668	0.8736	0.8775	0.8654	0.8783
30％	0.8258	0.8272	0.8200	0.8265	0.8408	0.8252	0.8354
								40％	0.7782	0.7910	0.7793	0.7836	0.7916	0.7867	0.7884
50％	0.7423	0.7408	0.7423	0.7467	0.7532	0.7500	0.7414
								60％	0.7012	0.7058	0.6973	0.7001	0.7117	0.6987	0.7090

Table 6 towed vehicle saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.8735	0.9002	0.8731	0.8905	0.8846	0.8912	0.8932
								20％	0.8095	0.8071	0.7846	0.8052	0.7897	0.8125	0.8146
30％	0.7262	0.7550	0.7221	0.7391	0.7426	0.7423	0.7468
								40％	0.6607	0.6851	0.6640	0.6916	0.6743	0.6798	0.6917
50％	0.6116	0.6208	0.6113	0.6353	0.6221	0.6341	0.6447
								60％	0.5699	0.5854	0.5559	0.5918	0.5809	0.6004	0.5923
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9022	0.8977	0.8970	0.8948	0.9051	0.9056	0.9049
								20％	0.8167	0.8253	0.8107	0.8253	0.8312	0.8234	0.8336
30％	0.7580	0.7630	0.7546	0.7557	0.7718	0.7698	0.7768
								40％	0.7032	0.7097	0.7035	0.7056	0.7165	0.7104	0.7177
50％	0.6491	0.6531	0.6535	0.6554	0.6625	0.6620	0.6684
								60％	0.6040	0.6093	0.6067	0.6094	0.6174	0.6200	0.6197

Each quasi-representative lorry dedicated Lanes saturation flow rate adjustment factor:

Each quasi-representative lorry dedicated Lanes saturation flow rate adjustment factor of table 7

5m

10m

15m

20m

25m

30m

35m

High capacity waggon	0.5476	0.5987	0.5829	0.6071	0.5776	0.6136	0.6037
								Container car	0.5134	0.5532	0.5308	0.5499	0.5640	0.5555	0.5850
Towed vehicle	0.4479	0.4579	0.4155	0.4444	0.4559	0.4635	0.4513
									40m	45m	50m	55m	60m	65m	70m
High capacity waggon	0.6243	0.6278	0.6070	0.6149	0.6231	0.6347	0.6332
								Container car	0.5760	0.5839	0.5894	0.5973	0.5946	0.5810	0.5843
Towed vehicle	0.4912	0.4892	0.4747	0.4710	0.4775	0.5070	0.5078

3, typical lorry correction factor computing method:

In the actual conditions, as follows to the computing method of each quasi-representative lorry correction factor

respectively with mixed row ratio condition to different radiuss of turn:

I, when

, can obtain the correction factor of respective type lorry through question blank 1, table 2 and table 3; (table 1 is the high capacity waggon saturation flow rate adjustment factor; Table 2 is the container car saturation flow rate adjustment factor; Table 3 is the towed vehicle saturation flow rate adjustment factor.) wherein, r _kRadius of turn for k class lorry under the actual conditions; Be i radius in the k class lorry correction factor table,

p _kAccount for the ratio (the back literary composition is called for short the row ratio of mixing) of left turning vehicle sum for k class left-hand rotation lorry under the actual conditions; Be j in the k class lorry correction factor table mixed row ratio,

II, when

, calculating formula is: ${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k^i,p_k}=p_k^{*}\&times;({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}});$ Wherein,

is that k class lorry mixes row ratio relative coefficient, and promptly

is the correction factor of k class lorry under i radius, the individual mixed capable ratio condition of j (j+1);

III, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k,p_k^j}=r_k^{*}\&times;\left(\right|{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}|+\min \{{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j},{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}\left\}\right);$ Wherein, is the radius relative coefficient of k class lorry, and promptly

is the correction factor of k class lorry under the individual radius of i (i+1), a j mixed row ratio condition;

IV, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}=p_k^{*}\&times;r_k^{*}\&times;\left[\begin{array}{c}|({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}})-({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})|\\ +\min \{({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}}),({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})\}\end{array}\right];$ Meaning of parameters is the same;

Respectively calculate the correction factor that formula can calculate each quasi-representative lorry of actual conditions through above-mentioned, promptly

Wherein

Be radius r ₁(r ₂, r ₃), lorry mixes row ratio p ₁(p ₂, p ₃) correction factor under the condition;

According to the correction factor of all kinds of lorries of aforementioned calculation, the calculating that according to the lorry exclusive left-turn lane critical condition is set again judges whether to be provided with the lorry exclusive left-turn lane.

(3) condition analysis is put on the lorry exclusive left-turn lane right side:

1, the superiority condition analysis is put on the right side

I satisfies the vehicle performance demand

Because the truck vehicle performance has notable difference property than minibus; Especially lorry needs bigger radius when turning; And the minimal curve radius of general articulator is 10.5m～12.5m, is provided with through changing the crossing inlet road, and the lorry exclusive left-turn lane right side is put; Can improve radius of turn satisfying lorry turning demand, and then ensure that lorry turns left through the stationarity and the smoothness of crossing;

II left-hand rotation saturation volume rate increases

Utilize VISSIM emulation to draw the saturation volume rate change curve under the different radiuss of turn of each quasi-representative high capacity waggon, each quasi-representative lorry left-hand rotation saturation volume rate increases with radius of turn, and the advantage that put on the lorry exclusive left-turn lane right side has been described.As shown in Figure 3.

2, the critical condition analysis is put on the right side

Suppose that the setting of subtend entrance driveway track, crossing has symmetry, as shown in Figure 4.Dedicated left turn lane lorry critical condition is the right home to meet the special left turn lane lorry truck running distance between the curves

where

is the minimum safe distance.

I minimum safe distance computing method:

Is minimum safe distance with the vehicle ' lateral clearance apart from δ, and calculating formula is as follows: δ=0.7+0.02 (v ₁+ v ₂); Wherein, v ₁(v ₂) be that this is to (subtend) vehicle operating speed of a motor vehicle;

Suppose that subtend entrance driveway track, crossing is provided with form and has symmetry, i.e. v ₁=v ₂Be reduced to: δ=0.7+0.04v; Wherein, v is left-hand rotation lorry operation average speed;

Crossing radius of turn r and turning operating speed v relational expression are: wherein,

is the type of vehicle coefficient; α is the turning road grade;

crossing planar horizontal α=0 when type of vehicle is large car; Have so: $d_s^{\min }=\mathrm{\&delta;}=0.7+0.04\sqrt{r\&times;19.5}.$

II geometric locus distance computation method:

Fig. 4 Smalt rectangle is the border of crossing, and the width of B, D mouth is l ₁, the width of A, C mouth is l ₂With crossing B entrance driveway is example, and left turn lane 2 is the lorry exclusive left-turn lane, and its inlet radius is y ₁, going out port radius is x ₁, the lorry mean radius of turning left so

Because crossing subtend entrance driveway has symmetry, obviously the mean radius of subtend lorry left-hand rotation also is d ₁

According to geometric relationship, the known d that works as ₁When being on the same straight line with Δ d and Δ l, distance is minimum between the subtend lorry exclusive left-turn lane lorry operation curve, and wherein Δ l is a crossing rectangle diagonal distance; Minor increment is calculated by formula between the subtend lorry exclusive left-turn lane lorry operation curve so:

III critical condition is confirmed:

The differentiation formula that put on the lorry exclusive left-turn lane right side is:

Other constraint condition of IV is analyzed:

1. as shown in Figure 5, the red arrow of crossing B entrance driveway is represented the operation curve of lorry left turn lane vehicle among the figure, works as x ₁=y ₁The time, be regarded as left turn lane the optimum position is set, wherein y ₁Be inlet radius, x ₁For going out port radius; Though continue the right saturation volume rate that can increase the lorry exclusive left-turn lane of putting, it is not remarkable to improve effect, and the transition right side puts and can increase the working time of lorry in the crossing, and the increase on occasioning a delay on the contrary is so suggestion can not be put on the blindness right side;

2. to put be that a kind of novel entrance driveway is provided with form on the left turn lane right side; It is that left turn lane is in left side, crossing inlet road that China driver generally realizes; Obviously this driving habits with the left-hand rotation of driver left side is runed counter to, and the left turn lane right side so rationally is set puts and just be necessary to further investigate and analyze.

(4) separate type left turn lane subsidiary conditions are analyzed

1, lorry exclusive left-turn lane sign

The lorry exclusive left-turn lane is that a kind of novel crossing inlet road is provided with form, and the present invention will design the sign of a suitable lorry exclusive left-turn lane again, and will be as shown in Figure 6.

2, curved area to be transferred, a left side is provided with

The lorry exclusive left-turn lane of putting for the right side will not be provided with curved area to be transferred, a left side; The present invention mainly considers to avoid the right side to put the left turn lane vehicle straightgoing vehicle is in the same way caused interference; In addition; The present invention considers also and keeps certain safe distance to putting the left turn lane vehicle to the right that the therefore right lorry left turn lane of putting is not provided with curved area to be transferred, a left side; But still keep curved area to be transferred, an original left side for the not right lorry exclusive left-turn lane of putting.

(5) the intersection signal timing method of separate type lorry exclusive left-turn lane

1, the traffic conflict of separate type left turn lane is analyzed

Fig. 7 and shown in Figure 8 is provided with under the condition for the special-purpose two left turn lanes of separate type (separate); The conflict analysis diagram of this phase place i (separate type left turn phase) left turning vehicle and adjacent phase; Shown in legend, need meet the following conditions interval time for the green light of i-1 and i phasetophase and i and i+1 phasetophase:

I, i-1 and i phasetophase green light interval time

For satisfying condition of i-1 and i phasetophase green light interval time, with Fig. 7 example, keep straight on latter stage of i-1 phase place green light is respectively time that last bus arrives conflict point 71,72

The time that i phase place green light initial stage left-hand rotation first bus arrives conflict point 71,72 is respectively

Only need to satisfy: Wherein, t _sBe personal distance time (generally getting 2s), Be the green light interval time (s) of i-1 phase place and i phasetophase under the separate type condition.

II, i and i+1 phasetophase green light interval time

For satisfying condition of i and i+1 phasetophase green light interval time; With Fig. 8 is example, i phase place green light turn left latter stage time that last bus arrives conflict point 1,2,3,4 be respectively

i+1 phase place green light initial stage craspedodrome first bus arrive conflict point 1,2,3,4 time is respectively only needs to satisfy: $\left\{\begin{array}{c}{t}_1^{i+1}+I_1^{i,i+1}\&GreaterEqual;t_1^i\left(\mathrm{outer}\right)+t_s\\ t_3^{i+1}+I_2^{i,i+1}\&GreaterEqual;t_3^i\left(\mathrm{inner}\right)+t_s\end{array}\right.;$ The green light of i phase place and i+1 phasetophase is

interval time so wherein;

is green light chosen candidate value interval time that the left side straightgoing vehicle conflicts with the left-hand rotation car,

be green light chosen candidate value interval time that the right side straightgoing vehicle conflicts with the left-hand rotation car.

2, intersection signal timing

Signal total losses time L under the condition of special-purpose passenger-cargo track _tCalculating formula is:

Wherein, L _sBe lost time at green light initial stage (s);

It is the green light interval time (s) of i phase place and i+1 phasetophase; A is amber light duration (s), generally gets 3s; I is a number of phases.

Optimum signal cycle C under the unitrain left turn lane condition _T0Calculating formula is:

Y wherein _tFor each phase place maximum flow compares sum.

Below in conjunction with specific embodiment and accompanying drawing the present invention is further elaborated.

One, separate type lorry exclusive left-turn lane is provided with form

1, original road pattern

Original left turn lane passage mode is passenger-cargoly to mix the crossing of working, and large car needs turn left from the entrance driveway leftmost side, and is as shown in Figure 1.

2, new road passage mode

Novel left turn lane passage mode is that separate type left turn lane group is separated and be provided with to passenger vehicle, lorry, and it is separated through the crossing fully, and satisfies the left-hand rotation radius of lorry, and is as shown in Figure 2.

Two, separate type lorry exclusive left-turn lane is provided with condition analysis

1, the lorry exclusive left-turn lane is provided with condition analysis

1.1 the lorry exclusive left-turn lane is provided with critical condition

The present invention considers that the saturated release flow rate that front and back are set through contrast lorry exclusive left-turn lane determines whether being provided with the lorry exclusive left-turn lane, and the lorry exclusive left-turn lane is provided with critical condition suc as formula shown in (1) so:

$2S_{\mathrm{mix}}^{r,p}\&le;S_{\mathrm{car}}^r+S_{\mathrm{truck}}^r---\left(1\right)$

Wherein,

is for mixing the saturation volume rate of runway under radius r, mixed row ratio p condition;

is the saturation volume rates of minibus dedicated Lanes under the radius r condition;

is the saturation volume rates of lorry dedicated Lanes under the radius r condition;

According to above-mentioned analysis; The present invention considers to adopt each quasi-representative lorry; Be high capacity waggon (about the long 10m of vehicle body), container car (about the long 14m of vehicle body), towed vehicle (about the long 18m of vehicle body), the saturation flow rate adjustment factor of minibus calculates and expresses the saturation volume rate of lorry relatively.And in actual conditions, the lorry kind is not to be single type, so just need comprehensively explain each quasi-representative lorry, specifies below:

At first, each quasi-representative truck vehicle number accounts for total left turning vehicle ratio of counting and is respectively p ₁, p ₂, p ₃Account for left-hand rotation truck vehicle sum ratio and be respectively η ₁, η ₂, η ₃Two kinds of proportionate relationships do

K=1 wherein, 2,3 (1 represents high capacity waggon, and 2 represent container car, and 3 represent towed vehicle); P is the ratio that left-hand rotation lorry total amount accounts for the left turning vehicle sum.

Mixing trade road comprehensive correction factor

calculating formula is:

$\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}=\frac{{\mathrm{\&epsiv;}}_1^{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_1,{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_1}\&times;{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_1+{\mathrm{\&epsiv;}}_2^{r_2,p_2}\&times;p_2+{\mathrm{\&epsiv;}}_3^{r_3,p_3}\&times;p_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{p}_k}---\left(2\right)$

Wherein, For lorry in radius r ₁(r ₂, r ₃), lorry ratio p ₁(p ₂, p ₃) correction factor under the condition;

Lorry dedicated Lanes comprehensive correction factor

calculating formula is:

${\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}=\frac{{\mathrm{\&epsiv;}}_1^{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_1,100\%}\&times;{\mathrm{\&eta;}}_1+{\mathrm{\&epsiv;}}_2^{r_2,100\%}\&times;{\mathrm{\&eta;}}_2+{\mathrm{\&epsiv;}}_3^{r_3,100\%}\&times;{\mathrm{\&eta;}}_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{\mathrm{\&eta;}}_k}---\left(3\right)$

Wherein,

For lorry in radius r ₁(r ₂, r ₃), the correction factor under lorry ratio 100% condition;

With getting in each correction factor substitution formula (1):

$2S_{\mathrm{car}}^r\&times;\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}\&le;S_{\mathrm{car}}^r+S_{\mathrm{car}}^r\&times;{\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}---\left(4\right)$

Since

Elimination

(4) formula reduces to:

$2\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}\&le;1+{\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}---\left(5\right)$

Hence one can see that, and the lorry exclusive left-turn lane is set when satisfying the following formula inequality relation, otherwise then the lorry exclusive left-turn lane is not set.

1.2 typical types lorry correction factor

The present invention utilizes VISSIM emulation to obtain each quasi-representative lorry at different radiuss of turn (5m～70m) and mix the saturation flow rate adjustment factor under row ratio (0%～60%) condition, and the saturation flow rate adjustment factor of the unitrain left turn lane under each quasi-representative lorry condition (lorry mixes row ratio 100%).

The correction factor of the different radius of turn different blended of each quasi-representative lorry row ratio is seen table 1, table 2, table 3; Wherein, table 1 is the high capacity waggon saturation flow rate adjustment factor; Table 2 is the container car saturation flow rate adjustment factor; Table 3 is the towed vehicle saturation flow rate adjustment factor.

Table 8 high capacity waggon saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9375	0.9279	0.9279	0.9267	0.9220	0.9271	0.9417
								20％	0.8586	0.8758	0.8667	0.8712	0.8550	0.8710	0.8787
30％	0.8304	0.8315	0.8072	0.8301	0.8227	0.8289	0.8374
								40％	0.7634	0.7871	0.7676	0.7874	0.7734	0.7854	0.8028
50％	0.7247	0.7273	0.7252	0.7480	0.7366	0.7496	0.7615
								60％	0.6905	0.7073	0.6910	0.7077	0.7005	0.7104	0.7236
	40m	45m	50m	55m	60m	65m	70m

0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
								10％	0.9348	0.9398	0.9307	0.9442	0.9397	0.9319	0.9324
20％	0.8871	0.8935	0.8841	0.8921	0.8883	0.8831	0.8827
								30％	0.8441	0.8427	0.8443	0.8526	0.8548	0.8441	0.8440
40％	0.8108	0.8072	0.8007	0.8096	0.8088	0.8045	0.8157
								50％	0.7658	0.7698	0.7603	0.7762	0.7658	0.7737	0.7707
60％	0.7345	0.7356	0.7247	0.7338	0.7336	0.7301	0.7383

Table 9 container car saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9107	0.9268	0.9008	0.9155	0.9184	0.9228	0.9194
								20％	0.8408	0.8614	0.8365	0.8615	0.8463	0.8525	0.8664
30％	0.8006	0.7949	0.7864	0.8019	0.8015	0.8174	0.8113
								40％	0.7336	0.7616	0.7337	0.7585	0.7515	0.7619	0.7737
50％	0.6920	0.7129	0.6953	0.7109	0.7059	0.7170	0.7327
								60％	0.6458	0.6696	0.6470	0.6812	0.6684	0.6819	0.6924
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9250	0.9352	0.9242	0.9214	0.9309	0.9272	0.9304
								20％	0.8669	0.8774	0.8668	0.8736	0.8775	0.8654	0.8783
30％	0.8258	0.8272	0.8200	0.8265	0.8408	0.8252	0.8354
								40％	0.7782	0.7910	0.7793	0.7836	0.7916	0.7867	0.7884
50％	0.7423	0.7408	0.7423	0.7467	0.7532	0.7500	0.7414
								60％	0.7012	0.7058	0.6973	0.7001	0.7117	0.6987	0.7090

Table 10 towed vehicle saturation flow rate adjustment factor

	5m	10m	15m	20m	25m	30m	35m
									0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.8735	0.9002	0.8731	0.8905	0.8846	0.8912	0.8932
								20％	0.8095	0.8071	0.7846	0.8052	0.7897	0.8125	0.8146
30％	0.7262	0.7550	0.7221	0.7391	0.7426	0.7423	0.7468
								40％	0.6607	0.6851	0.6640	0.6916	0.6743	0.6798	0.6917
50％	0.6116	0.6208	0.6113	0.6353	0.6221	0.6341	0.6447
								60％	0.5699	0.5854	0.5559	0.5918	0.5809	0.6004	0.5923
	40m	45m	50m	55m	60m	65m	70m
								0％	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000	1.0000
10％	0.9022	0.8977	0.8970	0.8948	0.9051	0.9056	0.9049
								20％	0.8167	0.8253	0.8107	0.8253	0.8312	0.8234	0.8336
30％	0.7580	0.7630	0.7546	0.7557	0.7718	0.7698	0.7768
								40％	0.7032	0.7097	0.7035	0.7056	0.7165	0.7104	0.7177

50％	0.6491	0.6531	0.6535	0.6554	0.6625	0.6620	0.6684
								60％	0.6040	0.6093	0.6067	0.6094	0.6174	0.6200	0.6197

Each quasi-representative lorry dedicated Lanes saturation flow rate adjustment factor is seen table 4:

Each quasi-representative lorry dedicated Lanes saturation flow rate adjustment factor of table 11

	5m	10m	15m	20m	25m	30m	35m
								High capacity waggon	0.5476	0.5987	0.5829	0.6071	0.5776	0.6136	0.6037
Container car	0.5134	0.5532	0.5308	0.5499	0.5640	0.5555	0.5850
								Towed vehicle	0.4479	0.4579	0.4155	0.4444	0.4559	0.4635	0.4513
	40m	45m	50m	55m	60m	65m	70m
								High capacity waggon	0.6243	0.6278	0.6070	0.6149	0.6231	0.6347	0.6332
Container car	0.5760	0.5839	0.5894	0.5973	0.5946	0.5810	0.5843
								Towed vehicle	0.4912	0.4892	0.4747	0.4710	0.4775	0.5070	0.5078

1.3 typical lorry correction factor computing method

In the actual conditions, as follows to the computing method of each quasi-representative lorry correction factor

respectively with mixed row ratio condition to different radiuss of turn:

I, when

, can obtain the correction factor of respective type lorry through question blank 1, table 2 and table 3; (table 1 is the high capacity waggon saturation flow rate adjustment factor; Table 2 is the container car saturation flow rate adjustment factor; Table 3 is the towed vehicle saturation flow rate adjustment factor.) for example in the high capacity waggon saturation flow rate adjustment factor,

such lorry one concrete vehicle radius of turn $r_k^{i+1}=r_k^i+5={\mathrm{<figure-callout\; id="1"\; label="r\; k"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">r</figure-callout>}}_k^{}+5=10m,$ ${\mathrm{<figure-callout\; id="1"\; label="p\; k"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_k^{}=p_k=0,$ $p_k^{j+1}=p_k^j+10\%={\mathrm{<figure-callout\; id="1"\; label="p\; k"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">p</figure-callout>}}_k^{}+10\%=10\%,$ The high capacity waggon saturation flow rate adjustment factor of tabling look-up gets 0.9279, and all the other situation can be analogized in view of the above.

Wherein, r _kRadius of turn for k class lorry under the actual conditions; Be i radius in the k class lorry correction factor table,

p _kAccount for the ratio (the back literary composition is called for short the row ratio of mixing) of left turning vehicle sum for k class left-hand rotation lorry under the actual conditions;

Be j in the k class lorry correction factor table mixed row ratio,

II, when

, calculate by formula (6):

${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k^i,p_k}=p_k^{*}\&times;({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})---\left(6\right)$

Wherein,

is that k class lorry mixes row ratio relative coefficient, and promptly

is the correction factor of k class lorry under i radius, the individual mixed capable ratio condition of j (j+1);

III, when

, calculate by formula (7):

${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k,p_k^j}=r_k^{*}\&times;\left(\right|{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}|+\min \{{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j},{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}\left\}\right)---\left(7\right)$

Wherein,

is the radius relative coefficient of k class lorry, and promptly

is the correction factor of k class lorry under the individual radius of i (i+1), a j mixed row ratio condition;

IV, when

, calculate by formula (8):

${\mathrm{\&epsiv;}}_k^{r_k,p_k}=p_k^{*}\&times;r_k^{*}\&times;\left[\begin{array}{c}|({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}})-({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})|\\ +\min \{({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}}),({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})\}\end{array}\right]---\left(8\right)$

Calculate the correction factor that formula can calculate each quasi-representative lorry of actual conditions through above-mentioned (6) to (8), promptly

Wherein

Be radius r ₁(r ₂, r ₃), lorry mixes row ratio p ₁(p ₂, p ₃) correction factor under the condition;

According to the correction factor of all kinds of lorries of aforementioned calculation, calculate according to formula (1) to (5) again and judge whether to be provided with the lorry exclusive left-turn lane.

Condition analysis is put on the 2 lorry exclusive left-turn lane right sides

2.1 the superiority condition analysis is put on the right side

I, satisfy the vehicle performance demand

Because the truck vehicle performance has notable difference property than minibus; Especially lorry needs bigger radius when turning; And the minimal curve radius of general articulator is 10.5m～12.5m, is provided with through changing the crossing inlet road, and the lorry exclusive left-turn lane right side is put; Can improve radius of turn satisfying lorry turning demand, and then ensure that lorry turns left through the stationarity and the smoothness of crossing.

II, left-hand rotation saturation volume rate increase

Utilize VISSIM emulation to draw the saturation volume rate change curve under the different radiuss of turn of each quasi-representative high capacity waggon, as shown in Figure 3:

Visible by Fig. 3, each quasi-representative lorry left-hand rotation saturation volume rate increases with radius of turn, and the advantage that put on the lorry exclusive left-turn lane right side has been described.

2.2 the critical condition analysis is put on the right side

Suppose that the setting of subtend entrance driveway track, crossing has symmetry, as shown in Figure 4.Dedicated left turn lane truck the right home for the critical condition is satisfied dedicated left turn lane to trucks trucks running distance between the curves

where

is the minimum safe distance.

I, minimum safe distance computing method:

Is minimum safe distance with the vehicle ' lateral clearance apart from δ, and calculating formula is as follows:

δ＝0.7+0.02(v ₁+v ₂)(9)

Wherein, v ₁(v ₂) be that this is to (subtend) vehicle operating speed of a motor vehicle;

Suppose that subtend entrance driveway track, crossing is provided with form and has symmetry, then the outside left turning vehicle speed of a motor vehicle is consistent, i.e. v ₁=v ₂Former formula is reduced to:

δ＝0.7+0.04v (10)

Wherein, v is left-hand rotation lorry operation average speed;

Crossing radius of turn r and turning operating speed v relation are seen formula (11):

Wherein,

is the type of vehicle coefficient; α is the turning road grade;

crossing planar horizontal α=0 when type of vehicle is large car; Simultaneous formula (10) and (11) arrangement abbreviation gets so:

$d_s^{\min }=\mathrm{\&delta;}=0.7+0.04\sqrt{r\&times;19.5}---\left(12\right)$

II, geometric locus distance computation method:

Fig. 4 Smalt rectangle is the border of crossing, and the width of B, D mouth is l ₁, the width of A, C mouth is l ₂With crossing B entrance driveway is example, and left turn lane 2 is the lorry exclusive left-turn lane, and its inlet radius is y ₁, going out port radius is x ₁, the lorry mean radius of turning left so

Because crossing subtend entrance driveway has symmetry, obviously the mean radius of subtend lorry left-hand rotation also is d ₁

According to geometric relationship, the known d that works as ₁When being on the same straight line with Δ d and Δ l, distance is minimum between the subtend lorry exclusive left-turn lane lorry operation curve, and wherein Δ l is a crossing rectangle diagonal distance; Minor increment is calculated by formula between the subtend lorry exclusive left-turn lane lorry operation curve so:

$\mathrm{\&Delta;d}=\sqrt{{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000152366860000031.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}^2+{l_2}^2}-2d_1---\left(13\right)$

III, critical condition are confirmed:

According to above-mentioned based on the computing method of distance and the computing method of the minimum safe distance between the Facing Movement vehicle between the subtend lorry exclusive left-turn lane lorry operation curve of crossing physical dimension; Can differentiate the feasibility that put on the lorry exclusive left-turn lane right side, promptly shown in the formula:

IV, other constraint condition are analyzed:

1. as shown in Figure 5, the red arrow of crossing B entrance driveway is represented the operation curve of lorry left turn lane vehicle among the figure, works as x ₁=y ₁The time, be regarded as left turn lane the optimum position is set, wherein y ₁Be inlet radius, x ₁For going out port radius; Though continue the right saturation volume rate that can increase the lorry exclusive left-turn lane of putting, improve effect and significantly, and the transition right side puts and can increase the working time of lorry in the crossing, the increase on occasioning a delay on the contrary is so suggestion can not be put on the blindness right side;

2. to put be that a kind of novel entrance driveway is provided with form on the left turn lane right side; It is that left turn lane is in left side, crossing inlet road that China driver generally realizes; Obviously this driving habits with the left-hand rotation of driver left side is runed counter to, and the left turn lane right side so rationally is set puts and just be necessary to further investigate and analyze.

3, separate type left turn lane subsidiary conditions are analyzed

3.1 lorry exclusive left-turn lane sign

The lorry exclusive left-turn lane is that a kind of novel crossing inlet road is provided with form, and the present invention will design the sign of a suitable lorry exclusive left-turn lane again, and will be as shown in Figure 6.

3.2 curved area to be transferred, a left side is provided with

The lorry exclusive left-turn lane of putting for the right side will not be provided with curved area to be transferred, a left side; The present invention mainly considers to avoid the right side to put the left turn lane vehicle straightgoing vehicle is in the same way caused interference; In addition; The present invention considers also and keeps certain safe distance to putting the left turn lane vehicle to the right that the therefore right lorry left turn lane of putting is not provided with curved area to be transferred, a left side; But still keep curved area to be transferred, an original left side for the not right lorry exclusive left-turn lane of putting.

Three, the intersection signal timing method of separate type lorry exclusive left-turn lane

1, the traffic conflict of separate type left turn lane is analyzed

Fig. 7 and shown in Figure 8 is provided with under the condition for the special-purpose two left turn lanes of separate type (separate); The conflict analysis diagram of this phase place i (separate type left turn phase) left turning vehicle and adjacent phase; Shown in legend, need meet the following conditions interval time for the green light of i-1 and i phasetophase and i and i+1 phasetophase:

I, i-1 and i phasetophase green light interval time

For satisfying condition of i-1 and i phasetophase green light interval time; With Fig. 7 is example, i-1 phase place green light keep straight on latter stage time that last bus arrives conflict point 71,72 be respectively

i phase place green light initial stage left-hand rotation first bus arrive conflict point 71,72 time is respectively

obviously exists

therefore only to need to satisfy:

$t_1^{i-1}+t_s\&le;t_1^i\left(\mathrm{inner}\right)+I_{\mathrm{sep}}^{i-1,i}---\left(15\right)$

Wherein, t _sBe personal distance time (generally getting 2s),

Be the green light interval time (s) of i-1 phase place and i phasetophase under the separate type condition.

II, i and i+1 phasetophase green light interval time

For satisfying condition of i and i+1 phasetophase green light interval time; With Fig. 8 is example, i phase place green light turn left latter stage time that last bus arrives conflict point 1,2,3,4 be respectively

i+1 phase place green light initial stage craspedodrome first bus arrive conflict point 1,2,3,4 time is respectively obviously have

so and because outside left turn lane turn inside diameter track has skew to the inside to a certain degree to have following relation:

$\left\{\begin{array}{c}{t}_1^i\left(\mathrm{outer}\right)\&GreaterEqual;t_2^i\left(\mathrm{inner}\right)\\ t_3^i\left(\mathrm{inner}\right)\&le;t_4^i\left(\mathrm{outer}\right)\end{array}\right.---\left(16\right)$

Therefore only need to satisfy:

$\left\{\begin{array}{c}{t}_1^{i+1}+I_1^{i,i+1}\&GreaterEqual;t_1^i\left(\mathrm{outer}\right)+t_s\\ t_3^{i+1}+I_2^{i,i+1}\&GreaterEqual;t_3^i\left(\mathrm{inner}\right)+t_s\end{array}\right.---\left(17\right)$

The green light of i phase place and i+1 phasetophase does interval time so

$I_{\mathrm{sep}}^{i,i+1}=\max \{I_1^{i,i+1},I_2^{i,i+1}\}---\left(18\right)$

Wherein

is green light chosen candidate value interval time that the left side straightgoing vehicle conflicts with the left-hand rotation car,

be green light chosen candidate value interval time that the right side straightgoing vehicle conflicts with the left-hand rotation car.

Fig. 7, the 8th, to the conflict analysis of separate type left turn phase, this part is different from the conflict situations of other left-hand rotation form.The purpose of conflict analysis is to analyze the green light interval time of separate type left turn phase and its front and back phasetophase, and the green light between other phase place is constant interval time.

2, intersection signal timing

Signal total losses time L under the condition of special-purpose passenger-cargo track _t, calculate by formula (19):

$L_t=\underset{i}{\mathrm{\&Sigma;}}{(L_s+I_{\mathrm{sep}}^i+A)}_i---\left(19\right)$

Wherein, L _sBe lost time at green light initial stage (s);

It is the green light interval time (s) of i phase place and i+1 phasetophase; A is amber light duration (s), generally gets 3s; I is a number of phases.

Optimum signal cycle C under the unitrain left turn lane condition _T0, calculate by formula (20):

${\mathrm{<figure-callout\; id="0"\; label="C\; t"\; filenames="HDA0000152366860000021.png"\; state="\{\{state\}\}">C</figure-callout>}}_t=\frac{1.5L_t+5}{1-Y_t}---\left(20\right)$

Y wherein _tFor each phase place maximum flow compares sum.

The present invention proposes the novel canalization form of separate type lorry exclusive left-turn lane; Obtaining the lorry exclusive left-turn lane through theoretical analysis is provided with condition on the one hand; And utilize emulation experiment to obtain typical types lorry saturation flow rate adjustment factor; Set up the lorry exclusive left-turn lane critical condition model has been set, and provided the computing method that the lorry exclusive left-turn lane is provided with condition; Put the critical condition analysis through the right side being put the superiority condition and the right side on the other hand, provide the condition that is provided with that put on the lorry exclusive left-turn lane right side; Provide the signal time distributing conception that adapts to separate type unitrain left turn lane at last.This method has remedied the blank of this research field, for the setting of level-crossing lorry exclusive left-turn lane provides foundation.

Claims (3)

1. a separate type lorry exclusive left-turn lane method to set up is characterized in that, comprises the following steps:

(1) calculating that according to the lorry exclusive left-turn lane critical condition is set judges whether to be provided with the lorry exclusive left-turn lane:

When satisfying inequality

The lorry exclusive left-turn lane is set when concerning, otherwise then the lorry exclusive left-turn lane is not set; Wherein: mix trade road comprehensive correction factor

Calculating formula is:

For corresponding lorry in radius r ₁, r ₂, r ₃, lorry ratio p ₁, p ₂, p ₃Lorry correction factor under the condition;

Lorry special lane comprehensive correction factor

calculating formula is: ${\stackrel{\&OverBar;}{\mathrm{\&epsiv;}}}^{\&prime;}=\frac{{\mathrm{\&epsiv;}}_1^{r_1,100\%}\&times;{\mathrm{\&eta;}}_1+{\mathrm{\&epsiv;}}_2^{r_2,100\%}\&times;{\mathrm{\&eta;}}_2+{\mathrm{\&epsiv;}}_3^{r_3,100\%}\&times;{\mathrm{\&eta;}}_3}{\underset{k=1}{\overset{3}{\mathrm{\&Sigma;}}}{\mathrm{\&eta;}}_k},$

For corresponding lorry in radius r ₁, r ₂, r ₃, the correction factor under lorry ratio 100% condition;

(2) analyze the lorry exclusive left-turn lane right side and put condition:

Calculate the right side and put critical condition, differentiate whether put on the lorry exclusive left-turn lane right side: the critical condition that put on the lorry exclusive left-turn lane right side be satisfy between the subtend lorry exclusive left-turn lane lorry operation curve distance wherein be minimum safe distance; Δ d is a minor increment between the subtend lorry exclusive left-turn lane lorry operation curve; Is minimum safe distance with the vehicle ' lateral clearance apart from δ, and calculating formula is as follows:

δ=0.7+0.02 (v ₁+ v ₂); Wherein, v ₁, v ₂For this to, opposed vehicle operating speed;

Suppose that subtend entrance driveway track, crossing is provided with form and has symmetry, i.e. v ₁=v ₂Be reduced to:

δ=0.7+0.04v; Wherein, v is left-hand rotation lorry operation average speed;

Crossing radius of turn r and turning operating speed v relational expression are: wherein, is the type of vehicle coefficient; α is the turning road grade;

crossing planar horizontal α=0 when type of vehicle is large car; Have so: $d_s^{\min }=\mathrm{\&delta;}=0.7+0.04\sqrt{r\&times;19.5};$

(3) analyze separate type left turn lane subsidiary conditions:

The lorry left turn lane that put on the right side is not provided with curved area to be transferred, a left side, still keeps curved area to be transferred, an original left side for the not right lorry exclusive left-turn lane of putting;

(4) the intersection signal timing of separate type lorry exclusive left-turn lane:

1. ",, the traffic conflict of separate type left turn lane analyzes

Green light for i-1 and i phasetophase and i and i+1 phasetophase need meet the following conditions interval time, and wherein the i phase place is this phase place, i.e. the separate type left turn phase:

I, i-1 and i phasetophase green light interval time

For satisfying condition of i-1 and i phasetophase green light interval time; If interior survey left turn lane vehicle and opposite through vehicles conflict point are conflict point 71; The outside left turn lane vehicle and opposite through vehicles conflict point are conflict point 72, and keep straight on latter stage of i-1 phase place green light is respectively time of last bus arrival conflict point 71,72

The time that i phase place green light initial stage left-hand rotation first bus arrives conflict point 71,72 is respectively

Only need to satisfy:

Wherein, t _sBe the personal distance time, unit second,

Be the green light interval time of i-1 phase place and i phasetophase under the separate type condition, unit second;

II, i and i+1 phasetophase green light interval time

For satisfying condition of i and i+1 phasetophase green light interval time; Outside left turn lane vehicle is a conflict point 1 with through vehicles conflict point from right to left; Inboard left turn lane vehicle is a conflict point 2 with through vehicles conflict point from right to left; Inboard left turn lane vehicle is a conflict point 3 with through vehicles conflict point from left to right; Outside left turn lane vehicle is a conflict point 4 with through vehicles conflict point from left to right, and turn left latter stage of i phase place green light is respectively time that

i+1 phase place green light initial stage craspedodrome first bus arrives conflict point 1,2,3,4 and is respectively

and only needs to satisfy time that last bus arrives conflict point 1,2,3,4: $\left\{\begin{array}{c}{t}_1^{i+1}+I_1^{i,i+1}\&GreaterEqual;t_1^i\left(\mathrm{outer}\right)+t_s\\ t_3^{i+1}+I_2^{i,i+1}\&GreaterEqual;t_3^i\left(\mathrm{inner}\right)+t_s\end{array}\right.;$ The green light of i phase place and i+1 phasetophase is

interval time so wherein;

is green light chosen candidate value interval time that the left side straightgoing vehicle conflicts with the left-hand rotation car, be green light chosen candidate value interval time that the right side straightgoing vehicle conflicts with the left-hand rotation car;

2., intersection signal timing

Signal total losses time L under the condition of special-purpose passenger-cargo track _tCalculating formula is:

Wherein, L _sBe lost time at green light initial stage, unit second;

Be the green light interval time of i phase place and i+1 phasetophase, unit second; A is the amber light duration, unit second; I is a number of phases;

Optimum signal cycle C under the unitrain left turn lane condition _T0Calculating formula is: Y wherein _tFor each phase place maximum flow compares sum.

2. separate type lorry exclusive left-turn lane method to set up as claimed in claim 1; It is characterized in that, as follows to the computing method of each quasi-representative lorry correction factor

respectively with mixed row ratio condition to different radiuss of turn:

I, when

The time, can obtain the correction factor of respective type lorry through question blank 1, table 2 and table 3; , table 1 is the high capacity waggon saturation flow rate adjustment factor; Table 2 is the container car saturation flow rate adjustment factor; Table 3 is the towed vehicle saturation flow rate adjustment factor; Wherein, r _kRadius of turn for k class lorry under the actual conditions;

Be i radius in the k class lorry correction factor table,

p _kFor k class left-hand rotation lorry under the actual conditions accounts for the total ratio of left turning vehicle, be called for short the row ratio of mixing; Be j in the k class lorry correction factor table mixed row ratio,

Table 1 high capacity waggon saturation flow rate adjustment factor

5m 10m 15m 20m 25m 30m 35m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10％ 0.9375 0.9279 0.9279 0.9267 0.9220 0.9271 0.9417 20％ 0.8586 0.8758 0.8667 0.8712 0.8550 0.8710 0.8787 30％ 0.8304 0.8315 0.8072 0.8301 0.8227 0.8289 0.8374

40％ 0.7634 0.7871 0.7676 0.7874 0.7734 0.7854 0.8028 50％ 0.7247 0.7273 0.7252 0.7480 0.7366 0.7496 0.7615 60％ 0.6905 0.7073 0.6910 0.7077 0.7005 0.7104 0.7236 40m 45m 50m 55m 60m 65m 70m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10％ 0.9348 0.9398 0.9307 0.9442 0.9397 0.9319 0.9324 20％ 0.8871 0.8935 0.8841 0.8921 0.8883 0.8831 0.8827 30％ 0.8441 0.8427 0.8443 0.8526 0.8548 0.8441 0.8440 40％ 0.8108 0.8072 0.8007 0.8096 0.8088 0.8045 0.8157 50％ 0.7658 0.7698 0.7603 0.7762 0.7658 0.7737 0.7707 60％ 0.7345 0.7356 0.7247 0.7338 0.7336 0.7301 0.7383

Table 2 container car saturation flow rate adjustment factor

5m 10m 15m 20m 25m 30m 35m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10％ 0.9107 0.9268 0.9008 0.9155 0.9184 0.9228 0.9194 20％ 0.8408 0.8614 0.8365 0.8615 0.8463 0.8525 0.8664 30％ 0.8006 0.7949 0.7864 0.8019 0.8015 0.8174 0.8113 40％ 0.7336 0.7616 0.7337 0.7585 0.7515 0.7619 0.7737 50％ 0.6920 0.7129 0.6953 0.7109 0.7059 0.7170 0.7327 60％ 0.6458 0.6696 0.6470 0.6812 0.6684 0.6819 0.6924 40m 45m 50m 55m 60m 65m 70m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10％ 0.9250 0.9352 0.9242 0.9214 0.9309 0.9272 0.9304 20％ 0.8669 0.8774 0.8668 0.8736 0.8775 0.8654 0.8783 30％ 0.8258 0.8272 0.8200 0.8265 0.8408 0.8252 0.8354 40％ 0.7782 0.7910 0.7793 0.7836 0.7916 0.7867 0.7884 50％ 0.7423 0.7408 0.7423 0.7467 0.7532 0.7500 0.7414 60％ 0.7012 0.7058 0.6973 0.7001 0.7117 0.6987 0.7090

Table 3 towed vehicle saturation flow rate adjustment factor

5m 10m 15m 20m 25m 30m 35m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10％ 0.8735 0.9002 0.8731 0.8905 0.8846 0.8912 0.8932 20％ 0.8095 0.8071 0.7846 0.8052 0.7897 0.8125 0.8146 30％ 0.7262 0.7550 0.7221 0.7391 0.7426 0.7423 0.7468 40％ 0.6607 0.6851 0.6640 0.6916 0.6743 0.6798 0.6917 50％ 0.6116 0.6208 0.6113 0.6353 0.6221 0.6341 0.6447 60％ 0.5699 0.5854 0.5559 0.5918 0.5809 0.6004 0.5923 40m 45m 50m 55m 60m 65m 70m 0％ 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000

10％ 0.9022 0.8977 0.8970 0.8948 0.9051 0.9056 0.9049 20％ 0.8167 0.8253 0.8107 0.8253 0.8312 0.8234 0.8336 30％ 0.7580 0.7630 0.7546 0.7557 0.7718 0.7698 0.7768 40％ 0.7032 0.7097 0.7035 0.7056 0.7165 0.7104 0.7177 50％ 0.6491 0.6531 0.6535 0.6554 0.6625 0.6620 0.6684 60％ 0.6040 0.6093 0.6067 0.6094 0.6174 0.6200 0.6197

II, when

, calculating formula is: ${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k^i,p_k}=p_k^{*}\&times;({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}});$ Wherein,

is that k class lorry mixes row ratio relative coefficient; Promptly

is the correction factor of k class lorry under i radius, a j mixed row ratio condition,

be the correction factor of k class lorry under i radius, a j+1 mixed row ratio condition;

III, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}={\mathrm{\&epsiv;}}_k^{r_k,p_k^j}=r_k^{*}\&times;\left(\right|{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}|+\min \{{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j},{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}\left\}\right);$ Wherein, is the radius relative coefficient of k class lorry; Promptly

is the correction factor of k class lorry under i radius, a j mixed row ratio condition,

be the correction factor of k class lorry under i+1 radius, a j mixed row ratio condition;

IV, when

, calculating formula is:

${\mathrm{\&epsiv;}}_k^{r_k,p_k}=p_k^{*}\&times;r_k^{*}\&times;\left[\begin{array}{c}|({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}})-({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})|\\ +\min \{({\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^{i+1},p_k^{j+1}}),({\mathrm{\&epsiv;}}_k^{r_k^i,p_k^j}-{\mathrm{\&epsiv;}}_k^{r_k^i,p_k^{j+1}})\}\end{array}\right].$

3. separate type lorry exclusive left-turn lane method to set up as claimed in claim 1 is characterized in that, the geometric locus distance computation method of minimum safe distance:

If AC and BD are the crossing, the width of B, D mouth is l ₁, the width of A, C mouth is l ₂With crossing B entrance driveway is example, and left turn lane 2 is the lorry exclusive left-turn lane, and its inlet radius is y ₁, going out port radius is x ₁, the lorry mean radius of turning left so

Because crossing subtend entrance driveway has symmetry, the mean radius that the subtend lorry turns left also is d ₁

According to geometric relationship, the known d that works as ₁When being on the same straight line with Δ d and Δ l, distance is minimum between the subtend lorry exclusive left-turn lane lorry operation curve, and wherein Δ l is a crossing rectangle diagonal distance; Minor increment is calculated by formula between the subtend lorry exclusive left-turn lane lorry operation curve so:

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