CN103208196A - Lane adjusting method for urban artery turning traffic - Google Patents

Abstract

The invention discloses a lane adjusting method for urban artery turning traffic. The method is used for relieving tidal flow in urban roads and mainly comprises the number of variable lanes in need of direction changing and a lane turning function determining method after lane adjustment. The method comprises that variable-direction traffic setting conditions of urban arteries are given, the number of variable lanes and the lane turning functions after lane adjustment are determined by combining control of tidal intersection signals, and intersection delay values are calculated and compared to obtain the lane adjusting method for urban artery turning traffic. According to the lane adjusting method, the intersection signal control and the variable-direction traffic technology are combined, so that the tidal traffic jam is relieved, the delay is reduced, and the utilization rate of existing road resources is improved effectively.

Description

Track method of adjustment towards arterial street break-in traffic

Technical field

The invention belongs to road traffic control field, be specifically related to definite method that each track after a kind of changeable driveway quantity towards arterial street break-in traffic and the track adjustment turns to function.

Background technology

In recent years, along with space and the function in China city are adjusted, multicenter, new city, city district (circle) etc. become the new model of spatial spread, increasing family lives in Xincheng District, be operated in the downtown area, go off daily relies on car, and " duty lives to separate " phenomenon is quite general.Thereupon, traffic flow on the contact channel of new city and center presents tangible tidal regime: early (evening) peak (going out) city direction often occurs into and blocks up because the path resource wretched insufficiency often causes the property sent out, and the phenomenon that is underutilized of rightabout path resource simultaneously.According to domestic and international years'experiences, a kind of effective and feasible measure of alleviating this phenomenon is used the break-in traffic technique exactly.Lack at present the research that intersection signal control and break-in traffic technique is combined to alleviate the morning and evening tides traffic congestion, also not after the adjustment of two-way lane quantity each track turn to the theoretical method of function aspects.

Summary of the invention

The objective of the invention is to propose a kind of track method of adjustment towards arterial street break-in traffic.Comprise that needs change two parts of definite method that each track after the changeable driveway quantity of direction and the track adjustment turns to function, intersection signal control is combined to alleviate the morning and evening tides traffic congestion with the break-in traffic technique, reduce to incur loss through delay, effectively improve the utilization factor of existing road resource.

The technical solution used in the present invention is: the track method of adjustment towards arterial street break-in traffic may further comprise the steps:

A. calculate volume of traffic direction nonuniformity coefficient K _D:

Volume of traffic direction nonuniformity coefficient computing formula is:

$K_D=\frac{q_1}{{\mathrm{<figure-callout\; id="1"\; label="q"\; filenames="HDA00003081526100022.png"\; state="\{\{state\}\}">q</figure-callout>}}_1+q_2}$

In the formula:

q ₁---the heavy traffic flow path direction magnitude of traffic flow (pcu/h);

q ₂---the light traffic flow path direction magnitude of traffic flow (pcu/h).

B. judge whether to satisfy the break-in traffic condition be set:

The condition that arranges of break-in traffic comprises following six aspects:

Condition one: the motor vehicle number of track-lines is more than two-way 3 tracks on the road, and number of track-lines is generally more than 6 on the bigger city thoroughfare of the volume of traffic, is at least 5;

Condition two: the track, crossing be not suitable for extending or the situation of widening under;

Condition three: significantly " tidal phenomena " will be arranged on the highway section, such as very big at a certain certain period of time vehicle flowrate, cause and block up, and the other times vehicle flowrate is all normal, necessity of implementing the break-in traffic is just arranged this moment;

Condition four: exist the highway section of morning and evening tides traffic if will implement the break-in traffic, need to satisfy a standard, in peak period, the direction vehicle flowrate in this highway section exceeds 40% than the opposite direction wagon flow, be that the minimum need of volume of traffic direction distribution coefficient reach 2/3, as far as possible more than 3/4;

Condition five: the heavy traffic direction is being used the subtend track, and after namely the light traffic direction reduced number of track-lines, the traffic capacity of the two-way lane after should guaranteeing to adjust satisfied demand separately;

Condition six: the terminal that the break-in traffic route is set should can not form new traffic bottlenecks by sufficient traffic processing power, and makes things convenient for vehicle turnover track.

If satisfying the break-in traffic arranges condition, each track turned to function after further changeable driveway quantity and track adjustment were determined in calculating; If do not satisfy, then select morning and evening tides traffic intersection signal control prioritization scheme.

C. each track turns to function after determining changeable driveway quantity and track adjustment:

Step 1: the traffic capacity of calculating the two-way road of present situation:

$C_a=n_L\&CenterDot;S_L\&CenterDot;\left(\frac{g_{\mathrm{NL}}}{T_N}\right)+n_T\&CenterDot;S_T\&CenterDot;\left(\frac{g_{\mathrm{NT}}}{T_N}\right)+n_R\&CenterDot;S_R\&CenterDot;\left(\frac{g_{\mathrm{NR}}}{T_N}\right)$

$C_a^{\&prime;}=n_L^{\&prime;}\&CenterDot;S_L\&CenterDot;\left(\frac{g_{\mathrm{ML}}}{T_M}\right)+n_T^{\&prime;}\&CenterDot;S_T\&CenterDot;\left(\frac{g_{\mathrm{MT}}}{T_M}\right)+n_R^{\&prime;}\&CenterDot;S_R\&CenterDot;\left(\frac{g_{\mathrm{MR}}}{T_M}\right)$

In the formula:

C _a, C _a' be respectively the traffic capacity of the two-way road of present situation, pcu/h;

T _M---the signal period duration of crossing M, s;

T _N---the signal period duration of crossing N, s;

S _L, S _T, S _RBe respectively the saturation volume of a left-hand rotation, craspedodrome, right-turn lane, can get 1550pcu/h, 1650pcu/h, 1550pcu/h respectively;

n _L, n _T, n _RBe respectively left-hand rotation, craspedodrome, the right-turn lane quantity of highway section a direction;

g _NL, g _NT, g _NRBe respectively the crossing a of N place direction entrance driveway and respectively turn to the Effective Green Time duration of phase place, s;

n _L', n _T', n _R' be respectively left-hand rotation, craspedodrome, the right-turn lane quantity of highway section a ' direction;

g _ML, g _MT, g _MRBe respectively a ' of M place, crossing direction entrance driveway and respectively turn to the Effective Green Time duration of phase place, s.

Step 2: when supposing changeable driveway quantity Δ n=1, calculate q respectively _LiAnd q _TiWherein, q _LiThe left-hand rotation bicycle road flow of the traffic flow direction of attaching most importance to; q _TiThe craspedodrome bicycle road flow of the traffic flow direction of attaching most importance to.

If q _LiGreater than q _Ti, this changeable driveway is set to dedicated Lanes, and current for the left turn traffic of heavy traffic flow path direction, the function in other three tracks is constant; If q _LiLess than q _Ti, with the left-hand rotation dedicated Lanes of changeable driveway as the heavy traffic flow path direction, the fast lane before the adjustment of track becomes craspedodrome by original left-hand rotation.

In like manner can determine each lane function of light traffic flow path direction: work as q _LiGreater than q _TiThe time, this direction left turn lane quantity reduces, and left turning vehicle lane change to the adjacent outside left turn lane that originally travels on changeable driveway travels; Work as q _LiLess than q _TiThe time, the Through Lane quantity of this direction reduces, and left turning vehicle is mobile laterally, and originally the most inboard Through Lane lane change to adjacent outside Through Lane travels.

Step 3: after two-way lane quantity and function change, reselect morning and evening tides intersection signal control scheme, and calculate signal timing dial, see Table 1.

Table 1

Step 4: combine with morning and evening tides traffic intersection signal phase optimization scheme, calculate traffic capacity C and C ' that latter two direction is adjusted in the track, computing method are identical with present situation.

Step 5: judge whether to satisfy two constraint conditions of number of track-lines and the traffic capacity.

Condition one: number of track-lines condition

$\left\{\begin{array}{c}0\&le;\mathrm{\&Delta;n}\&le;n_a\\ 0\&le;\mathrm{\&Delta;n}\&le;n_a^{\&prime;}\end{array}\right.$

Wherein:

n _a＝n _L+n _T+n _R

n′ _a＝n′ _L+n′ _T+n′ _R

Condition two: traffic capacity condition

$\left\{\begin{array}{c}{q}_L+q_T+q_R\&le;C\\ q_L^{\&prime;}+q_T^{\&prime;}+q_R^{\&prime;}\&le;C^{\&prime;}\end{array}\right.$

In the formula, q _L, q _T, q _RBe respectively left-hand rotation, craspedodrome and the right-hand rotation flow of its excess-three of M place, crossing entrance driveway remittance highway section a direction, pcu/h; q _L', q _T', q _R' be respectively left-hand rotation, craspedodrome and right-hand rotation flow that its excess-three of N place, crossing entrance driveway imports highway section a ' direction, pcu/h.

If satisfy above two constraint conditions, then carry out the calculating of step 6; Otherwise, enter step 7.

Step 6: calculate the intersection delay value after the track is adjusted.

Step 7: make changeable driveway quantity increase by 1, i.e. Δ n=2,3 ..., n _aThe time, repeating step two obtains each intersection delay to the computation process of step 6.

Step 8: if when changeable driveway quantity is i, can not satisfy number of track-lines and traffic capacity constraint condition, Δ n=1 relatively then, 2,3 ..., the intersection delay value during i-1, this value is changeable driveway quantity for Δ n hour.

So far, that finishes each track after changeable driveway quantity and the track quantity adjustment turns to determining of function, obtains towards the track method of adjustment of arterial street break-in traffic.

Beneficial effect: the purpose towards the track method of adjustment of arterial street break-in traffic that the present invention proposes is the morning and evening tides traffic behavior that exists on the urban road in order to alleviate, comparing maximum characteristics with existing method is: 1. usually can be by in the crossing signal controlling scheme being optimized and adjusting to alleviate for the morning and evening tides traffic congestion, and improving its utilization factor by flexible adjustment existing road resource, the break-in traffic technique also often is used, the present invention combines the break-in traffic technique with intersection signal control, thereby obtains the track method of adjustment of arterial street break-in traffic; 2. the present invention proposes the lane function that combines with intersection signal control and repartition scheme, thereby finish the heavily distribution to the existing road resource, after the quantity of having determined changeable driveway, the heavy traffic flow path direction obtains more multilane, the light traffic flow path direction is the corresponding track of having reduced then, different before traffic supply and demand ratio and the track adjustment of this moment, during present break-in traffic track is adjusted, after the track quantity of needs change direction is determined, usually reduce direction in the track and adopt the no left turn strategy, this needs left turn traffic to find a way out in addition, increased the operating range of left turning vehicle, method among the present invention can guarantee that each turns to wagon flow normally current, and the pathfinding wire-wound is capable in addition and do not need part to turn to wagon flow.

Description of drawings

Fig. 1 is urban road intersection list import clearance scheme synoptic diagram in the prior art.

The mixing clearance scheme that Fig. 2 combines with single import for urban road intersection symmetry in the prior art.

Fig. 3 mixes " opening the early disconnected late " scheme of letting pass with single import for urban road intersection symmetry in the prior art.

Fig. 4 adjusts the preceding traffic capacity for changeable driveway quantity and calculates synoptic diagram.

Fig. 5 turns to function splitting scheme synoptic diagram for each track of left-hand rotation bicycle road flow heavy traffic flow path direction when big.

Fig. 6 turns to function splitting scheme synoptic diagram for each track of craspedodrome bicycle road flow heavy traffic flow path direction when big.

Fig. 7 is towards the track method of adjustment process flow diagram of arterial street break-in traffic.

Embodiment

The present invention will be further described below in conjunction with the drawings and specific embodiments.

To there being the arterial street of morning and evening tides traffic, at first calculate volume of traffic direction nonuniformity coefficient K _DThen judge whether to satisfy the break-in traffic condition is set: if satisfying the break-in traffic arranges condition, determine changeable driveway quantity by calculating, otherwise, select morning and evening tides traffic intersection signal control prioritization scheme, see Table 1,

Table 1

Each signal phase scheme in the table is seen Fig. 1, Fig. 2, Fig. 3 respectively.

Be example with two-way six-lane, each track turns to definite method of function to be after changeable driveway quantity and the track adjustment:

Step 1: calculate the traffic capacity of the two-way road of present situation, as shown in Figure 4.

Step 2: when supposing changeable driveway quantity Δ n=1, calculate q respectively _LiAnd q _Ti, wherein, q _LiThe left-hand rotation bicycle road flow of the traffic flow direction of attaching most importance to; q _TiThe craspedodrome bicycle road flow of the traffic flow direction of attaching most importance to.

If q _LiGreater than q _Ti, this changeable driveway is set to dedicated Lanes, and current for the left turn traffic of heavy traffic flow path direction, the function in other three tracks is constant, sees Fig. 5; If q _LiLess than q _Ti, with the left-hand rotation dedicated Lanes of changeable driveway as the heavy traffic flow path direction, the fast lane before the adjustment of track becomes craspedodrome by original left-hand rotation, sees Fig. 6.

In like manner, each lane function of light traffic flow path direction determines that method is: work as q _LiGreater than q _TiThe time, this direction left turn lane quantity reduces, and left turning vehicle lane change to the adjacent outside left turn lane that originally travels on changeable driveway travels; Work as q _LiLess than q _TiThe time, the Through Lane quantity of this direction reduces, and left turning vehicle is mobile laterally, and originally the most inboard Through Lane lane change to adjacent outside Through Lane travels.

Step 3: after two-way lane quantity and function change, reselect morning and evening tides intersection signal control scheme, see Table 1 equally, and calculate signal timing dial.

Step 4: combine with morning and evening tides traffic intersection signal phase optimization scheme, calculate traffic capacity C and C ' that latter two direction is adjusted in the track, computing method are identical with step 1.

Step 5: judge whether to satisfy two constraint conditions of number of track-lines and the traffic capacity, if satisfy above two constraint conditions, then carry out the calculating of step 6; Otherwise, enter step 7.

Step 6: calculate the intersection delay value after the track is adjusted.

Step 7: make changeable driveway quantity increase by 1, i.e. Δ n=2,3 ..., n _aThe time, repeating step two obtains each intersection delay to the computation process of step 6.

Step 8: if when changeable driveway quantity is i, can not satisfy number of track-lines and traffic capacity constraint condition, Δ n=1 relatively then, 2,3 ..., the intersection delay value during i-1, this value is changeable driveway quantity for Δ n hour.

Through above step, can determine the function that turns in each track after changeable driveway quantity and the track quantity adjustment, thereby obtain the track method of adjustment process flow diagram towards arterial street break-in traffic, see Fig. 7.

Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each ingredient all available prior art realized.

Claims (3)

1. towards the track method of adjustment of arterial street break-in traffic, it is characterized in that: may further comprise the steps:

1) calculates volume of traffic direction nonuniformity coefficient KD;

$K_D=\frac{q_1}{q_1+q_2}$

In the formula:

q ₁---the heavy traffic flow path direction magnitude of traffic flow (pcu/h);

q ₂---the light traffic flow path direction magnitude of traffic flow (pcu/h);

2) judge whether to satisfy the break-in traffic condition be set: if satisfy the break-in traffic condition be set, by calculate determine changeable driveway quantity and track adjustment after each track turn to function; Otherwise, select morning and evening tides traffic intersection signal control prioritization scheme;

3) each track turns to definite method of function to be after changeable driveway quantity and the track adjustment:

Step 1: the traffic capacity of calculating the two-way road of present situation.

$C_a=n_L\&CenterDot;S_L\&CenterDot;\left(\frac{g_{\mathrm{NL}}}{T_N}\right)+n_T\&CenterDot;S_T\&CenterDot;\left(\frac{g_{\mathrm{NT}}}{T_N}\right)+n_R\&CenterDot;S_R\&CenterDot;\left(\frac{g_{\mathrm{NR}}}{T_N}\right)$

$C_a^{\&prime;}=n_L^{\&prime;}\&CenterDot;S_L\&CenterDot;\left(\frac{g_{\mathrm{ML}}}{T_M}\right)+n_T^{\&prime;}\&CenterDot;S_T\&CenterDot;\left(\frac{g_{\mathrm{MT}}}{T_M}\right)+n_R^{\&prime;}\&CenterDot;S_R\&CenterDot;\left(\frac{g_{\mathrm{MR}}}{T_M}\right)$

C wherein _a, C _a' be respectively the traffic capacity of the two-way road of present situation, pcu/h; T _MBe the signal period duration of crossing M, s; T _NBe the signal period duration of crossing N, s; S _L, S _T, S _RBe respectively the saturation volume of a left-hand rotation, craspedodrome, right-turn lane, can get 1550pcu/h, 1650pcu/h, 1550pcu/h respectively; n _L, n _T, n _RBe respectively left-hand rotation, craspedodrome, the right-turn lane quantity of highway section a direction; g _NL, g _NT, g _NRBe respectively the crossing a of N place direction entrance driveway and respectively turn to the Effective Green Time duration of phase place, s; n _L', n _T', n _R' be respectively left-hand rotation, craspedodrome, the right-turn lane quantity of highway section a ' direction; g _ML, g _MT, g _MRBe respectively a ' of M place, crossing direction entrance driveway and respectively turn to the Effective Green Time duration of phase place, s;

Step 2: when supposing changeable driveway quantity Δ n=1, calculate q respectively _LiAnd q _Ti, wherein, q _LiThe left-hand rotation bicycle road flow of the traffic flow direction of attaching most importance to; q _TiThe craspedodrome bicycle road flow of the traffic flow direction of attaching most importance to;

If q _LiGreater than q _Ti, this changeable driveway is set to dedicated Lanes, and current for the left turn traffic of heavy traffic flow path direction, the function in other three tracks is constant; If q _LiLess than q _Ti, with the left-hand rotation dedicated Lanes of changeable driveway as the heavy traffic flow path direction, the fast lane before the adjustment of track becomes craspedodrome by original left-hand rotation;

In like manner, each lane function of light traffic flow path direction determines that method is: work as q _LiGreater than q _TiThe time, this direction left turn lane quantity reduces, and left turning vehicle lane change to the adjacent outside left turn lane that originally travels on changeable driveway travels; Work as q _LiLess than q _TiThe time, the Through Lane quantity of this direction reduces, and left turning vehicle is mobile laterally, and originally the most inboard Through Lane lane change to adjacent outside Through Lane travels;

Step 3: after two-way lane quantity and function change, reselect morning and evening tides intersection signal control scheme, and calculate signal timing dial;

Step 4: combine with morning and evening tides traffic intersection signal phase optimization scheme, calculate traffic capacity C and C ' that latter two direction is adjusted in the track, computing method are identical with step 1;

Step 5: judge whether to satisfy two constraint conditions of number of track-lines and the traffic capacity;

Condition one: number of track-lines condition

$\left\{\begin{array}{c}0\&le;\mathrm{\&Delta;n}\&le;n_a\\ 0\&le;\mathrm{\&Delta;n}\&le;n_a^{\&prime;}\end{array}\right.$

Wherein:

n _a＝n _L+n _T+n _R

n′ _a＝n′ _L+n′ _T+n′ _R

Condition two: traffic capacity condition

$\left\{\begin{array}{c}{q}_L+q_T+q_R\&le;C\\ q_L^{\&prime;}+q_T^{\&prime;}+q_R^{\&prime;}\&le;C^{\&prime;}\end{array}\right.$

In the formula, q _L, q _T, q _RBe respectively left-hand rotation, craspedodrome and the right-hand rotation flow of its excess-three of M place, crossing entrance driveway remittance highway section a direction, pcu/h; q _L', q _T', q _R' be respectively left-hand rotation, craspedodrome and right-hand rotation flow that its excess-three of N place, crossing entrance driveway imports highway section a ' direction, pcu/h;

If satisfy above two constraint conditions, then carry out the calculating of step 6; Otherwise, enter step 7;

Step 6: calculate the intersection delay value after the track is adjusted;

Step 7: make changeable driveway quantity increase by 1, i.e. Δ n=2,3 ..., n _aThe time, repeat above step 2 to the computation process of step 6, obtain each intersection delay;

Step 8: if when changeable driveway quantity is i, can not satisfy number of track-lines and traffic capacity constraint condition, Δ n=1 relatively then, 2,3 ..., the intersection delay value during i-1, this value is changeable driveway quantity for Δ n hour.

2. the track method of adjustment towards arterial street break-in traffic according to claim 1 is characterized in that: the system of selection of described morning and evening tides traffic intersection signal control prioritization scheme sees the following form.

3. the track method of adjustment towards arterial street break-in traffic according to claim 1, it is characterized in that: the condition that arranges of described break-in traffic comprises following six aspects:

Condition one: the motor vehicle number of track-lines is more than two-way 3 tracks on the road, and number of track-lines is more than 5 on the bigger city thoroughfare of the volume of traffic;

Condition two: the track, crossing be not suitable for extending or the situation of widening under;

Condition three: significantly " tidal phenomena " will be arranged on the highway section;

Condition four: exist the highway section of morning and evening tides traffic if will implement the break-in traffic, need to satisfy a standard, in peak period, the direction vehicle flowrate in this highway section exceeds 40% than the opposite direction wagon flow, and namely the minimum need of volume of traffic direction distribution coefficient reach 2/3;

Condition five: the heavy traffic direction is being used the subtend track, and after namely the light traffic direction reduced number of track-lines, the traffic capacity of the two-way lane after should guaranteeing to adjust satisfied demand separately;

Condition six: the terminal that the break-in traffic route is set should can not form new traffic bottlenecks by sufficient traffic processing power, and makes things convenient for vehicle turnover track.

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