CN104036645A - Reversible-lane-based intersection signal control method - Google Patents

Abstract

The invention discloses a reversible-lane-based intersection signal control method. The method comprises the following steps of, firstly, at eligible intersections, mounting detectors, and laying annunciators, main signal lights, pre-signal lights, reversible lane dynamic signs, wherein the annunciators are provided with computer programs, and the main signal lights, the pre-signal lights and the reversible lane dynamic signs are associated with reversible lanes; secondly, according to historical data, determining approaches where the reversible lanes can be arranged, and starting reversible lane control schemes; thirdly, according to the left turn and straight traffic flow of the approaches and the relation between the number of lanes and the saturation flow, judging the operating directions of the reversible lanes; lastly, according to the directions of the reversible lanes, determining appropriate signal matching schemes. The reversible-lane-based intersection signal control method can improve the traffic capacity of the intersections, reduce delay at the intersections and guarantee vehicle driving safety of the intersections.

Description

Intersection signal control method based on changeable driveway

Technical field

The present invention relates to a kind of urban road intersection control method, relate in particular to a kind of intersection signal control method based on changeable driveway.

Background technology

Changeable driveway signal control method is according to the information that is arranged on the different period vehicle flowrates flow directions that on crossing inlet road, wagon detector collects, to flowing to regulate and control flexibly, the travel direction of changing Lane, and adjust original signal timing dial parameter according to changeable driveway traffic direction, fully improve road utilization rate, alleviate to greatest extent crossing traffic pressure and improve road passage capability.

Abroad the research starting morning to changeable driveway and relatively ripe, changeable driveway has been listed in a kind of conventional means of Lane regulation, has attempted practice at present in some cities, has obtained good effect.But along with the fast development of national economy and the continuous quickening of urbanization process, China's urban traffic jam is day by day serious.Road is reconstructed in simple building, increase road equipment is unable to catch up with the speed that transport need increases far away.Rationally utilizing urban road existing resource, formulating rational traffic control scheme is the effective means of alleviating current city congestion.On the basis of achievement in research, some domestic scholars have carried out a large amount of research to the application feasibility of changeable driveway abroad.

Urban intersection, as the important component part of Traffic Systems, is the node of transportation network and the bottleneck of urban transportation, and its function is to provide the place of intersecting different directions traffic flow selection traffic direction on circuit.Section relatively, the Different Traffic Flows of all directions is in crossing weaving, phase mutual interference, and its traffic capacity is far smaller than section.Therefore, go out road junction in crossing and arrange the traffic organization method of changeable driveway, can alleviate to a certain extent urban road intersection traffic congestion phenomenon.But at present, existing Lane use control is static, can not change track direction by the variation of the magnitude of traffic flow timely and accurately, can not carry out active according to the present situation of crossing and adapt to.

Summary of the invention

In view of this, for the deficiencies in the prior art, the invention provides a kind of intersection signal control method based on changeable driveway, by the cooperate optimization of Lane use control and active signal controlling, realize the maximum using of intersection capacity, significantly reduce vehicle by the delay of crossing.

In order to solve the problems of the technologies described above, the invention provides a kind of intersection signal control method based on changeable driveway, it comprises the following steps:

Step 1, be at least the entrance driveway of Four-Lane Road, be provided for recording the detecting device of each track vehicle number, teleseme, changeable driveway pre-signal machine, with ground variable lane sign, and four phase place intersections of at least one exclusive left-turn lane, at least one special straight runway and at least one changeable driveway are set at described entrance driveway;

Step 2, the mean delay time of calculating entrance driveway left-hand rotation direction and craspedodrome direction described in each, larger if an entrance driveway left-hand rotation direction is incured loss through delay, and its adjacent Through Lane traffic capacity residue arranges changeable driveway at this craspedodrome entrance driveway;

Step 3, this ground variable lane sign that this changeable driveway is periodically set is craspedodrome direction, this teleseme starts this changeable driveway traffic direction judgement, this entrance driveway craspedodrome flow of the last cycle of detecting by this detecting device and left-hand rotation flow, thereby judge that this changeable driveway is at the traffic direction in next cycle, if q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1)≤0, next variable period track traffic direction continues to keep keeping straight on, and proceeds to step 3.1; If q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1) > 0, next variable period track traffic direction is left-hand rotation, wherein, q _l: the last cycle left-hand rotation flow that detecting device detects, q _t: the last cycle craspedodrome flow that detecting device detects, n _l: entrance driveway is fixed exclusive left-turn lane number, n _s: entrance driveway is fixed special straight runway number, and 1: the number of track-lines of changeable driveway, X: the track saturation volume of left-hand rotation dedicated Lanes, Y: the track saturation volume of craspedodrome dedicated Lanes,

Step 4, adjust the signal timing dial of described crossing, if changeable driveway traffic direction is craspedodrome, signal timing dial when operation changeable driveway traffic direction is craspedodrome, if changeable driveway traffic direction is left-hand rotation, signal timing dial when operation changeable driveway traffic direction is left-hand rotation.

Preferably, in described step 1, this ground variable lane sign comprises main signal light, pre-signal lamp and changeable driveway dynamic symbol, this detecting device is located at first 25～200 meters of this entrance driveway stop line, this pre-signal is laid in, 45 meters of this entrance driveway upstreams, and this ground variable lane sign is laid in this changeable driveway region.

Preferably, in described step 2, adopt formula: $\stackrel{\‾}{d}=\frac{C{(1-u)}^2}{2(1-y)}+\frac{x^2}{2q(1-x)}-0.65{\left(\frac{C}{q^2}\right)}^{\frac{1}{3}}\·x^{(2+5u)}$ Calculate the mean delay time of each this entrance driveway left-hand rotation direction and craspedodrome direction, in formula, : crossing phase place vehicle mean delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arrival rate.

Preferably, in described step 3, if this changeable driveway of next cycle is for keeping straight on, when in next cycle, this entrance driveway craspedodrome green light phase place finishes, this pre-signal lamp of this changeable driveway, this main signal light and this changeable driveway dynamic symbol are adjusted into special craspedodrome state, if this changeable driveway of next cycle is for turning left, when this entrance driveway craspedodrome green light phase place finishes in next cycle, this pre-signal lamp of this changeable driveway, this main signal light and this ground changeable driveway dynamic symbol are adjusted into special left-hand rotation state.

Preferably, in described step 4, described phase place is four phase places, and this changeable driveway traffic direction is that while craspedodrome, signal timing dial is:

Calculate maximum flow ratio:

$y_i=\frac{q_i}{S_i}$

In formula, y _i: the maximum flow ratio of i phase place;

Q _i: the actual arrival in maximum flow track flow in i phase place;

S _i: the saturation volume in maximum flow track in i phase place,

Calculate the signal period:

$C_T=\frac{1.5L+5}{1-Y}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}}$

In formula, C _t: intersection signal cycle duration when changeable driveway direction is craspedodrome;

L: the total losses time is the summation differing from each phase place vehicle launch lost time and street lamp interval time and yellow time;

Y: the maximum flow of each phase place is than sum, the i.e. summation of each phase place actual flow and the ratio of saturation volume;

4: number of phases, four phase signal crossings,

Calculate each phase place effective green time:

$g_1=(C_T-L)\frac{y_1}{Y}=(C_T-L)\frac{q_1}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_2=(C_T-L)\frac{y_2}{Y}=(C_T-L)\frac{q_2}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_3=(C_T-L)\frac{y_3}{Y}=(C_T-L)\frac{q_3}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_4=(C_T-L)\frac{y_4}{Y}=(C_T-L)\frac{q_4}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

In formula, q ₁: Through Lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₂: left turn lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₃: Through Lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

6. the intersection signal control method based on changeable driveway as described in claim 1 or 5, is characterized in that: in described step 4, described phase place is four phase places, and this changeable driveway traffic direction is that while left-hand rotation, signal timing dial is:

Calculate maximum flow ratio:

$y_i=\frac{q_i}{S_i}$

Calculate the signal period:

$C_L=\frac{1.5L+5}{1-Y^{\′}}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}-\frac{1}{n_T-1}\·\frac{q_1}{1650}+\frac{1}{n_L+1}\·\frac{q_2}{1550}}$

In formula, C _l: intersection signal cycle duration when changeable driveway direction is left-hand rotation;

Y ': changeable driveway direction changes rear total flow than sum,

Calculate each phase place effective green time:

$g_1=(C_L-L)\frac{\frac{n_T}{n_T-1}{y}_1}{Y^{\′}}=\frac{(C_L-L)\×\frac{n_T}{n_T-1}\×\frac{q_1}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_2=(C_L-L)\frac{\frac{1}{n_{L+}1}{y}_2}{Y^{\′}}=\frac{(C_L-L)\×\frac{1}{n_{L+}1}\×\frac{q_2}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_3=(C_L-L)\frac{y_3}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_3}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_4=(C_L-L)\frac{y_4}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_4}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

Compared with prior art, of the present invention having the following advantages:

Changeable driveway dynamic control scheme of the present invention can pass through the left turn traffic amount and the straightgoing vehicle flow that detect in real time, adjusts the direction in track, and guarantee left-hand rotation and through vehicles smoothly by crossing, avoid occurring supersaturation as early as possible.This scheme not only at utmost ensures that the craspedodrome of crossing and left turning vehicle do not produce spillover, and also considering intersection total optimization, reduces intersection delay, increases intersection capacity.

Active signal timing plan of the present invention, by the vehicle flowrate size of real-time detection different directions and the traffic direction of changeable driveway, adjust in time signal time distributing conception, the green letter time of reasonable distribution, ensure that vehicle passes through smoothly within the signal period, the traffic loading of balanced all directions, thus realize active signal control.

Pre-signal, main signal and the ground dynamic symbol laid on changeable driveway of the present invention, guarantee vehicle can be selected in advance suitable current direction when current, meanwhile, passes through Lane use control, reduction crossing blocks up to produce and incurs loss through delay, and improves the security of operation of crossing.

Brief description of the drawings

Fig. 1 is the schematic diagram of the intersection signal control method based on changeable driveway;

Fig. 2 is the schematic diagram of changeable driveway;

Fig. 3 entrance driveway schematic diagram that is changeable driveway traffic direction when keeping straight on;

Fig. 4 entrance driveway schematic diagram that is changeable driveway traffic direction when turning left.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:

Fig. 1 is the schematic diagram of the intersection signal control method based on changeable driveway, as shown in Figure 1, first, in qualified crossing installation and measuring device, laying, the teleseme of computer program and main signal light, pre-signal lamp and the changeable driveway dynamic symbol relevant to changeable driveway are housed; Subsequently, historical data is determined the entrance driveway that changeable driveway can be set, and opens Lane use control scheme; Secondly, turn left to judge the traffic direction of changeable driveway with straightgoing vehicle flow, number of track-lines and saturation volume relation according to entrance driveway; Finally, according to the suitable signal time distributing conception of changeable driveway orientation determination.

Step 1 is specially: be Four-Lane Road or four phase place intersections above, that have or one or more exclusive left-turn lane and special straight runway at entrance driveway, video frequency vehicle detecting device, teleseme and changeable driveway pre-signal machine and ground variable lane sign for recording each track vehicle number are installed, video frequency vehicle Loop detector layout is at front 25 meters to 200 meters of crossing inlet road stop line, pre-signal is laid in, 45 meters of entrance driveway upstreams, ground variable lane sign is laid in changeable driveway region, if the direction of changeable driveway is for keeping straight on

Step 2 is specially: according to the historical enquiry data of each entrance driveway of crossing, utilize Robert Webster model $\stackrel{\‾}{d}=\frac{C{(1-u)}^2}{2(1-y)}+\frac{x^2}{2q(1-x)}-0.65{\left(\frac{C}{q^2}\right)}^{\frac{1}{3}}\·x^{(2+5u)}$ Calculate the mean delay time of each entrance driveway left-hand rotation direction and craspedodrome direction, in formula, : crossing phase place vehicle mean delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arrival rate.If it is larger that a certain entrance driveway left-hand rotation direction is incured loss through delay, and the adjacent Through Lane traffic capacity is more than needed, can be chosen in this entrance driveway changeable driveway is set.

Step 3 is specially: within 30 minutes, to be spaced apart one-period, in the time that each cycle starts, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted into craspedodrome direction, teleseme starts changeable driveway traffic direction determine mechanism, the last cycle entrance driveway craspedodrome flow and the left-hand rotation flow that detect by detecting device, thus judge the traffic direction of changeable driveway in next cycle.If q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1)≤0, next variable period track traffic direction continues to keep keeping straight on, and proceeds to step 3.1; If q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1) > 0, next variable period track traffic direction, for turning left, proceeds to step 3.2, in formula, q _l: the last cycle left-hand rotation flow that detecting device detects, q _t: the last cycle craspedodrome flow that detecting device detects, n _l: entrance driveway is fixed exclusive left-turn lane number, n _s: entrance driveway is fixed special straight runway number, and 1: the number of track-lines of changeable driveway, X: the track saturation volume of left-hand rotation dedicated Lanes, Y: the track saturation volume of craspedodrome dedicated Lanes,

Step 3.1: when this entrance driveway craspedodrome green light phase place finishes in next cycle, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted into special craspedodrome state,

Step 3.2: when this entrance driveway left-hand rotation green light phase place finishes in next cycle, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted into special left-hand rotation state,

Step 4 is specially: adjust the signal time distributing conception of crossing, if changeable driveway traffic direction is for keeping straight on, proceed to step 4.1; If changeable driveway traffic direction, for turning left, proceeds to step 4.2,

Step 4.1: signal time distributing conception when changeable driveway traffic direction is craspedodrome,

Step 4.1.1: calculate maximum flow ratio, computing formula is:

$y_i=\frac{q_i}{S_i}$

In formula, y _i: the maximum flow ratio of i phase place;

Q _i: the actual arrival in maximum flow track flow in i phase place;

S _i: the saturation volume in maximum flow track in i phase place,

Step 4.1.2: calculate the signal period, computing formula is:

$C_T=\frac{1.5L+5}{1-Y}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}}$

In formula, C _t: intersection signal cycle duration when changeable driveway direction is craspedodrome;

L: the total losses time is the summation differing from each phase place vehicle launch lost time and street lamp interval time and yellow time;

Y: the maximum flow of each phase place is than sum, the i.e. summation of each phase place actual flow and the ratio of saturation volume;

4: number of phases is here four phase signal crossings,

Step 4.1.3: calculate each phase place effective green time, computing formula is:

$g_1=(C_T-L)\frac{y_1}{Y}=(C_T-L)\frac{q_1}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_2=(C_T-L)\frac{y_2}{Y}=(C_T-L)\frac{q_2}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_3=(C_T-L)\frac{y_3}{Y}=(C_T-L)\frac{q_3}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_4=(C_T-L)\frac{y_4}{Y}=(C_T-L)\frac{q_4}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

In formula, q ₁: Through Lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₂: left turn lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₃: Through Lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

Step 4.2: signal time distributing conception when changeable driveway traffic direction is left-hand rotation,

Step 4.2.1: calculate maximum flow ratio, computing formula is:

$y_i=\frac{q_i}{S_i}$

Step 4.1.2: calculate the signal period, computing formula is:

$C_L=\frac{1.5L+5}{1-Y^{\′}}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}-\frac{1}{n_T-1}\·\frac{q_1}{1650}+\frac{1}{n_L+1}\·\frac{q_2}{1550}}$

In formula, C _l: intersection signal cycle duration when changeable driveway direction is left-hand rotation;

Y ': changeable driveway direction changes rear total flow than sum,

Step 4.1.3: calculate each phase place effective green time, computing formula is:

$g_1=(C_L-L)\frac{\frac{n_T}{n_T-1}{y}_1}{Y^{\′}}=\frac{(C_L-L)\×\frac{n_T}{n_T-1}\×\frac{q_1}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_2=(C_L-L)\frac{\frac{1}{n_{L+}1}{y}_2}{Y^{\′}}=\frac{(C_L-L)\×\frac{1}{n_{L+}1}\×\frac{q_2}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_3=(C_L-L)\frac{y_3}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_3}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_4=(C_L-L)\frac{y_4}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_4}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

1. changeable driveway introduction.

Fig. 2 is the schematic diagram of changeable driveway, as shown in Figure 2, taking entrance driveway as Four-Lane Road section as example:

There are 4 canalization tracks in the crossing inlet road that has changeable driveway, ensures left-hand rotation, craspedodrome, at least each 1 track of right-hand rotation vehicle, remains one and is arranged to changeable driveway.Changeable driveway is arranged between left turn lane and Through Lane, can realize easily the conversion of keeping straight on to and, normally current for public vehicles.

The left turn traffic of signalized intersections changeable driveway direction and craspedodrome wagon flow are let pass in different phase places.When left turn traffic or craspedodrome wagon flow flow increase gradually, until hypersaturated state, and changeable driveway is while being unsaturated state, changes the current direction of changeable driveway wagon flow, can alleviate to a certain extent the current pressure in supersaturation track, improve intersection capacity

2. crossing equipment is installed

Video frequency vehicle detecting device for recording each track vehicle number is installed in crossing, is laid teleseme and the signal lamp of signal controlling computer program are housed, and utilize optical cable and electric wire successively detecting device and teleseme to be coupled together; On changeable driveway, lay pre-signal lamp and variable surface mark simultaneously.

Video frequency vehicle detecting device is arranged on directly over entrance driveway, is positioned at the position of first 20 to 200 meters of stop line, takes the vehicle that enters entrance driveway, utilizes video identification technology to record the vehicle number on each track; Teleseme, according to the vehicle number of video frequency vehicle detector recording, adopts computer program to calculate the green light duration of the each phase place of signal lamp;

The mode that variable lane sign adopts lines and character to combine, mat formation with colour, color is green, concrete method to set up is to execute the solid white line of drawing 0.15 meter of width in both sides, track, and lay 1 meter wide green colored road surface, centre position, two ends, track arranges respectively the changeable driveway symbol word marking of one group of two ends with yellow arrows.

Pre-signal lamp is arranged on the section, upstream of changeable driveway, existing in situation of general conventional changeable driveway, entrance driveway solid line length is 20 meters, and pre-signal lamp is arranged on apart from 45 meters of stop lines and sentences and ensure that vehicle shifts to an earlier date acknowledge(ment) signal prompting, current by driveway travel directions mark indicated direction.

Track, variable ground dynamic symbol is located between pre-signal and main signal, opens left-hand rotation pilot lamp or craspedodrome pilot lamp according to changeable driveway traffic direction.

3. according to 2011 " urban road intersection planning specification " (GB50647), the desirable 1650pcu/h of Through Lane and left turn lane, 1550pcu/h in signalized intersections base saturation flow.

4. the intersection plan of establishment based on changeable driveway.

1) changeable driveway traffic direction is for keeping straight on.

Fig. 3 entrance driveway schematic diagram that is changeable driveway traffic direction when keeping straight on, as shown in Figure 3, in the time that entrance driveway left turn lane wagon flow is not more than Through Lane wagon flow, keep changeable driveway traffic direction for keeping straight on, in main signal light, changeable driveway respective signal lamp, pre-signal lamp, variable surface mark craspedodrome direction are opened, in figure, realize and represent bright light, dotted line represents not bright light.

2) changeable driveway traffic direction is for turning left.(referring to Fig. 4)

Fig. 4 entrance driveway schematic diagram that is changeable driveway traffic direction when turning left, as shown in Figure 4, in the time that entrance driveway left turn lane wagon flow is greater than Through Lane wagon flow, change changeable driveway traffic direction for turning left, in main signal light, changeable driveway respective signal lamp, pre-signal lamp, variable surface mark left-hand rotation direction are opened, in Fig. 4, realize and represent bright light, dotted line represents not bright light.

5. determining of intersection signal timing scheme correlation parameter.

1) determining of total losses time

The computing formula of total losses time is:

$L=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}(l_i+I_i-A_i)$

In formula, l _i: vehicle launch lost time, should survey, without the desirable 3s of time data;

I _i: green light interval time, yellow time adds the full red light clear crossing time, and yellow time should survey, and without the desirable 3s of time data, the complete red time should survey, without the desirable 3s of time data;

A _i: yellow time, have and should survey, without the desirable 3s of time data;

M: number of phases.

2) determining of maximum flow ratio

Wagon detector can detect the vehicle number that each track is passed through, in each phase place, by relatively finding out the track of flow maximum in transitable track, and record this peak flow values, because transitable track direction in each phase place is consistent, by the craspedodrome of previously known and the saturation volume of left turn lane, can obtain maximum flow ratio.

3) determining of number of phases

In the crossing that has changeable driveway, to let pass in different phase places from through vehicles owing to turning left, the impact of vehicle on crossing of not considering to turn right, can determine that this crossing is four phase signal controls, and suppose that craspedodrome phase place is prior to left turn phase.

Embodiment 1:

By the data acquisition on the spot to Xizhimen South Street, Beijing City and Chegongzhuang Dajie intersection, obtain this crossing peak hour traffic, as shown in the table:

Table 1 Xizhimennan Dajie and Chegongzhuang Dajie intersection peak hour flow table (veh/h)

Geometric layout's form of four entrance driveway in crossing is: 7 import tracks of eastern import (street, safety West) (left-hand rotation three, craspedodrome three, right-hand rotation one), 7 entrance driveway of western import (Chegongzhuang Dajie) (left-hand rotation three, craspedodrome three, right-hand rotation one), 6 entrance driveway of southing mouth (Fuchengmenbei Dajie) (left-hand rotation two, craspedodrome two, right-hand rotation two), 6 entrance driveway of northing mouth (Xizhimennan Dajie) (left-hand rotation two, craspedodrome three, right-hand rotation one).The signal timing dial situation of crossing is: thing import is kept straight on (45s), thing import is turned left (50s), north and south import is kept straight on (45s), north and south import is turned left (50s).

As shown in Table 1, eastern entrance driveway peak time left turn traffic is approximately 2 times of craspedodrome wagon flow, but its left turn lane number is identical with Through Lane number, therefore a Through Lane wherein can be arranged to changeable driveway.Use VISSIM microscopic simulation software to carry out changeable driveway intersection signal control method to this crossing, before and after implementing, set up respectively realistic model.

In the emulation cycle, each emulation period gets 600 seconds, carries out Multi simulation running, and simulation result is as shown in table 2, table 3.

Crossing vehicle mean delay when table 2 changeable driveway direction is craspedodrome

Crossing vehicle mean delay when table 3 changeable driveway direction is left-hand rotation

As can be seen from the above table, after carrying out Lane use control, the delay of left turning vehicle has obtained reduction, but because craspedodrome wagon flow has reduced by a track, its delay increases, but increasing degree is little.Can be according to comprehensive delay index can obtain changeable driveway and change front and back resultant effect, as shown in table 4.

Crossing vehicle mean delay before and after table 4 changeable driveway changes

As can be seen from the above table, the comprehensive delay reduces afterwards changeable driveway to be set.Therefore, arrange after changeable driveway in left-hand rotation and unbalanced peak time of craspedodrome wagon flow, traffic circulation is effect improved obviously can reduce the delay of crossing to a certain extent, improves the service level of crossing.

More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.

It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.

Claims (6)

1. the intersection signal control method based on changeable driveway, it comprises the following steps:

Step 1, be at least the entrance driveway of Four-Lane Road, be provided for recording the detecting device of each track vehicle number, teleseme, changeable driveway pre-signal machine, with ground variable lane sign, and four phase place intersections of at least one exclusive left-turn lane, at least one special straight runway and at least one changeable driveway are set at described entrance driveway;

Step 2, the mean delay time of calculating entrance driveway left-hand rotation direction and craspedodrome direction described in each, larger if an entrance driveway left-hand rotation direction is incured loss through delay, and its adjacent Through Lane traffic capacity residue arranges changeable driveway at this craspedodrome entrance driveway;

Step 3, this ground variable lane sign that this changeable driveway is periodically set is craspedodrome direction, this teleseme starts this changeable driveway traffic direction judgement, this entrance driveway craspedodrome flow of the last cycle of detecting by this detecting device and left-hand rotation flow, thereby judge that this changeable driveway is at the traffic direction in next cycle, if q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1)≤0, next variable period track traffic direction continues to keep keeping straight on, and proceeds to step 3.1; If q _l/ X (n _l+ 1)-q _t/ Y (n _t+ 1) > 0, next variable period track traffic direction is left-hand rotation, wherein, q _l: the last cycle left-hand rotation flow that detecting device detects, q _t: the last cycle craspedodrome flow that detecting device detects, n _l: entrance driveway is fixed exclusive left-turn lane number, n _s: entrance driveway is fixed special straight runway number, and 1: the number of track-lines of changeable driveway, X: the track saturation volume of left-hand rotation dedicated Lanes, Y: the track saturation volume of craspedodrome dedicated Lanes,

Step 4, adjust the signal timing dial of described crossing, if changeable driveway traffic direction is craspedodrome, signal timing dial when operation changeable driveway traffic direction is craspedodrome, if changeable driveway traffic direction is left-hand rotation, signal timing dial when operation changeable driveway traffic direction is left-hand rotation.

2. the intersection signal control method based on changeable driveway as claimed in claim 1, it is characterized in that: in described step 1, this ground variable lane sign comprises main signal light, pre-signal lamp and changeable driveway dynamic symbol, this detecting device is located at first 25～200 meters of this entrance driveway stop line, this pre-signal is laid in, 45 meters of this entrance driveway upstreams, and this ground variable lane sign is laid in this changeable driveway region.

3. the intersection signal control method based on changeable driveway as claimed in claim 1, is characterized in that: in described step 2, adopt formula: $\stackrel{\‾}{d}=\frac{C{(1-u)}^2}{2(1-y)}+\frac{x^2}{2q(1-x)}-0.65{\left(\frac{C}{q^2}\right)}^{\frac{1}{3}}\·x^{(2+5u)}$ Calculate the mean delay time of each this entrance driveway left-hand rotation direction and craspedodrome direction, in formula, : crossing phase place vehicle mean delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arrival rate.

4. the intersection signal control method based on changeable driveway as claimed in claim 2, it is characterized in that: in described step 3, if this changeable driveway of next cycle is for keeping straight on, when in next cycle, this entrance driveway craspedodrome green light phase place finishes, by this pre-signal lamp of this changeable driveway, this main signal light and this changeable driveway dynamic symbol are adjusted into special craspedodrome state, if this changeable driveway of next cycle is for turning left, when in next cycle, this entrance driveway craspedodrome green light phase place finishes, by this pre-signal lamp of this changeable driveway, this main signal light and this ground changeable driveway dynamic symbol are adjusted into special left-hand rotation state.

5. the intersection signal control method based on changeable driveway as claimed in claim 1, is characterized in that: in described step 4, described phase place is four phase places, and this changeable driveway traffic direction is that while craspedodrome, signal timing dial is:

Calculate maximum flow ratio:

$y_i=\frac{q_i}{S_i}$

In formula, y _i: the maximum flow ratio of i phase place;

Q _i: the actual arrival in maximum flow track flow in i phase place;

S _i: the saturation volume in maximum flow track in i phase place;

Calculate the signal period:

$C_T=\frac{1.5L+5}{1-Y}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}}$

In formula, C _t: intersection signal cycle duration when changeable driveway direction is craspedodrome;

L: the total losses time is the summation differing from each phase place vehicle launch lost time and street lamp interval time and yellow time;

Y: the maximum flow of each phase place is than sum, the i.e. summation of each phase place actual flow and the ratio of saturation volume;

4: number of phases, four phase signal crossings;

Calculate each phase place effective green time:

$g_1=(C_T-L)\frac{y_1}{Y}=(C_T-L)\frac{q_1}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_2=(C_T-L)\frac{y_2}{Y}=(C_T-L)\frac{q_2}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_3=(C_T-L)\frac{y_3}{Y}=(C_T-L)\frac{q_3}{1650}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

$g_4=(C_T-L)\frac{y_4}{Y}=(C_T-L)\frac{q_4}{1550}/\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}$

In formula, q ₁: Through Lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₂: left turn lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₃: Through Lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects.

6. the intersection signal control method based on changeable driveway as described in claim 1 or 5, is characterized in that: in described step 4, described phase place is four phase places, and this changeable driveway traffic direction is that while left-hand rotation, signal timing dial is:

Calculate maximum flow ratio:

$y_i=\frac{q_i}{S_i}$

In formula, y _i: the maximum flow ratio of i phase place;

Q _i: the actual arrival in maximum flow track flow in i phase place;

S _i: the saturation volume in maximum flow track in i phase place;

Calculate the signal period:

$C_L=\frac{1.5L+5}{1-Y^{\′}}=\frac{1.5L+5}{1-\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}-\frac{1}{n_T-1}\·\frac{q_1}{1650}+\frac{1}{n_L+1}\·\frac{q_2}{1550}}$

In formula, C _l: intersection signal cycle duration when changeable driveway direction is left-hand rotation;

L: the total losses time is the summation differing from each phase place vehicle launch lost time and street lamp interval time and yellow time;

Y ': after changeable driveway direction changes, total flow compares sum;

4: number of phases, four phase signal crossings;

Calculate each phase place effective green time:

$g_1=(C_L-L)\frac{\frac{n_T}{n_T-1}{y}_1}{Y^{\′}}=\frac{(C_L-L)\×\frac{n_T}{n_T-1}\×\frac{q_1}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_2=(C_L-L)\frac{\frac{1}{n_{L+}1}{y}_2}{Y^{\′}}=\frac{(C_L-L)\×\frac{1}{n_{L+}1}\×\frac{q_2}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_3=(C_L-L)\frac{y_3}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_3}{1650}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

$g_4=(C_L-L)\frac{y_4}{Y^{\′}}=\frac{(C_L-L)\text{\×}\frac{q_4}{1550}}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\frac{q_i}{S_i}+\frac{n_T}{n_T-1}\×\frac{q_1}{1650}-\frac{1}{n_L+1}\×\frac{q_2}{1550}}$

In formula, q ₁: Through Lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₂: left turn lane maximum flow in the last cycle changeable driveway entrance driveway that detecting device detects;

Q ₃: Through Lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in the entrance driveway adjacent with changeable driveway of last cycle that detecting device detects.