CN104036645B - Based on the intersection signal control method of changeable driveway - Google Patents

Abstract

The invention discloses a kind of intersection signal control method based on changeable driveway, it comprises the following steps: first, installs detecting device, lays teleseme and the main signal light relevant to changeable driveway, pre-signal lamp and changeable driveway dynamic symbol that computer program is housed in qualified crossing; Subsequently, historical data determines the entrance driveway that can arrange changeable driveway, 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, suitable signal time distributing conception is determined according to changeable driveway direction.The present invention can improve the traffic capacity of crossing, reduces the delay of crossing, ensures intersection vehicles driving safety.

Description

Based on the intersection signal control method of changeable driveway

Technical field

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

Background technology

Changeable driveway signal control method is the information according to being arranged on the Different periods vehicle flowrate flow direction that wagon detector on crossing inlet road collects, flexible modulation is carried out to the flow direction, the travel direction of changing Lane, and adjust original signal timing dial parameter according to changeable driveway traffic direction, abundant raising road utilization rate, alleviates intersection traffic pressure to greatest extent and improves road passage capability.

Abroad start to walk early and relative maturity to the research of changeable driveway, changeable driveway has been listed in a kind of conventional means of Lane regulation, has attempted practice at present in some cities, achieves 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.Simple building is reconstructed road, is increased the speed that road equipment is unable to catch up with transport need growth far away.Appropriate application urban road existing resource, to formulate rational traffic control scheme be the effective means alleviating current urban congestion situation.On the basis of achievement in research abroad, some domestic scholars have carried out large quantifier elimination to the application feasibility of changeable driveway.

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 different directions traffic flow on crossing circuit and selects the place of traffic direction.Relative section, the Different Traffic Flows of all directions is in crossing weaving, mutually disturb, and its traffic capacity is far smaller than section.Therefore, go out the traffic organization method that road junction arranges changeable driveway in crossing, urban road intersection traffic congestion phenomenon can be alleviated to a certain extent.But at present, existing Lane use control is static, direction, track can not be changed by the change of the magnitude of traffic flow timely and accurately, namely can not carry out Initial adaption according to the present situation of crossing.

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 that Lane use control and active signal control, realize the maximum using of intersection capacity, significantly reduce the delay of vehicle by 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, detecting device for recording each track vehicle number is set, 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, calculates the mean delay time in entrance driveway left-hand rotation direction and craspedodrome direction described in each, if an entrance driveway left-hand rotation direction is incured loss through delay comparatively large, and its adjacent Through Lane traffic capacity residue, then changeable driveway is set at this craspedodrome entrance driveway;

Step 3, this ground variable lane sign periodically arranging this changeable driveway is craspedodrome direction, this teleseme starts this changeable driveway traffic direction and judges, this entrance driveway craspedodrome flow of the last cycle detected by this detecting device and left-hand rotation flow, thus judge the traffic direction of this changeable driveway in next cycle, if q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)]≤0, then next variable period track traffic direction continues to keep keeping straight on; If q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)] > 0, then next variable period track traffic direction is for turning left, 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 fixes exclusive left-turn lane number, n _t: entrance driveway fixes special straight driving number of channels, and 1: the number of track-lines of changeable driveway, S _l: the track saturation volume of left-hand rotation dedicated Lanes, S _t: the track saturation volume of craspedodrome dedicated Lanes;

Step 4, adjusting the signal timing dial of described crossing, if changeable driveway traffic direction is for keeping straight on, running signal timing dial when changeable driveway traffic direction is craspedodrome, if changeable driveway traffic direction is for turning left, run signal timing dial when 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 to be located at before this entrance driveway stop line 25 ~ 200 meters, this pre-signal lamp is laid in, 45 meters, this entrance driveway upstream, 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 in each this entrance driveway left-hand rotation direction and craspedodrome direction, in formula, crossing phase place vehicles average delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arriving rate.

Preferably, in described step 3, if this changeable driveway of next cycle is for keeping straight on, then in next cycle at the end of this entrance driveway craspedodrome green light phase place, this pre-signal lamp of this changeable driveway, this main signal light and this changeable driveway dynamic symbol are adjusted to special craspedodrome state, if this changeable driveway of next cycle is for turning left, then in next cycle, at the end of this entrance driveway craspedodrome green light phase place, this pre-signal lamp of this changeable driveway, this main signal light and this ground changeable driveway dynamic symbol are adjusted to 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 when keeping straight on, signal timing dial is:

Calculating maximum flow compares:

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

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

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

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

Calculate the signal period:

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

In formula, C _t: intersection signal cycle duration when changeable driveway direction is for keeping straight on;

L: total losses time, be each phase place vehicle launch lost time and street lamp interval time and yellow time difference summation;

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

4: number of phases, four phase signal crossings,

Calculate each phase place effective green time:

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

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

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

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

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 entrance driveway adjacent with changeable driveway of the last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in entrance driveway adjacent with changeable driveway of the 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, and described phase place is four phase places, and this changeable driveway traffic direction is that when turning left, signal timing dial is:

Calculating maximum flow compares:

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

Calculate the signal period:

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

In formula, C _l: intersection signal cycle duration when changeable driveway direction is for turning left;

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

Calculate each phase place effective green time:

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

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

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

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

Compared with prior art, of the present inventionly to have the following advantages:

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

Active signal control program of the present invention, by the traffic direction of the vehicle flowrate size and changeable driveway that detect different directions in real time, timely adjustment signal time distributing conception, the reasonable distribution green letter time, ensure that vehicle passes through smoothly within the signal period, the traffic loading of balanced all directions, thus achieve active signal control.

Of the present inventionly on changeable driveway, lay pre-signal, main signal and ground dynamic symbol, ensure that vehicle can select suitable current direction in advance when current, meanwhile, pass through Lane use control, reduction crossing blocks up to produce and incurs loss through delay, and improves the security of operation of crossing.

Accompanying drawing explanation

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 is changeable driveway traffic direction is entrance driveway schematic diagram during craspedodrome;

Fig. 4 is changeable driveway traffic direction is entrance driveway schematic diagram during left-hand rotation.

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, detecting device is installed in qualified crossing, lays teleseme and the main signal light relevant to changeable driveway, pre-signal lamp and changeable driveway dynamic symbol that computer program is housed; Subsequently, historical data determines the entrance driveway that can arrange changeable driveway, 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, suitable signal time distributing conception is determined according to changeable driveway direction.

Step 1 is specially: be Four-Lane Road or more at entrance driveway, have four phase place intersections of or one or more exclusive left-turn lane and special straight runway, video-based vehicle detection for recording each track vehicle number, teleseme and changeable driveway pre-signal machine and ground variable lane sign are installed, video-based vehicle detection is laid in front 25 meters to 200 meters of crossing inlet road stop line, changeable driveway pre-signal machine is laid in, 45 meters, entrance driveway upstream, 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 history 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 in each entrance driveway left-hand rotation direction and craspedodrome direction, in formula, crossing phase place vehicles average delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arriving rate.If a certain entrance driveway left-hand rotation direction is incured loss through delay comparatively large, and the adjacent Through Lane traffic capacity is had more than needed, and can select to arrange changeable driveway at this entrance driveway.

Step 3 is specially: be spaced apart one-period with 30 minutes, when each cycle starts, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted to craspedodrome direction, teleseme starts changeable driveway traffic direction and differentiates mechanism, the last cycle entrance driveway craspedodrome flow detected by detecting device and left-hand rotation flow, thus judge the traffic direction of changeable driveway in next cycle.If q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)]≤0, then next variable period track traffic direction continues to keep keeping straight on, and proceeds to step 3.1; If q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)] > 0, then next variable period track traffic direction is for turning left, and proceeds to step 3.2, 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 fixes exclusive left-turn lane number, n _t: entrance driveway fixes special straight driving number of channels, and 1: the number of track-lines of changeable driveway, S _l: the track saturation volume of left-hand rotation dedicated Lanes, S _t: the track saturation volume of craspedodrome dedicated Lanes;

Step 3.1: in next cycle at the end of this entrance driveway craspedodrome green light phase place, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted to special craspedodrome state,

Step 3.2: in next cycle at the end of this entrance driveway left-hand rotation green light phase place, changeable driveway pre-signal lamp, main signal light and ground changeable driveway dynamic symbol are adjusted to special left-hand rotation state,

Step 4 is specially: the signal time distributing conception of adjustment crossing, if changeable driveway traffic direction is for keeping straight on, proceeds 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 for keeping straight on,

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 the i-th phase place;

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

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

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

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

In formula, C _t: intersection signal cycle duration when changeable driveway direction is for keeping straight on;

L: total losses time, be each phase place vehicle launch lost time and street lamp interval time and yellow time difference summation;

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

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

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

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

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

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

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

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 entrance driveway adjacent with changeable driveway of the last cycle that detecting device detects;

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

Step 4.2: signal time distributing conception when changeable driveway traffic direction is for turning left,

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:

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

In formula, C _l: intersection signal cycle duration when changeable driveway direction is for turning left;

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

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

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

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

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

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

1. changeable driveway introduction.

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

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

The left turn traffic in 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 when changeable driveway is unsaturated state, change the current direction of changeable driveway wagon flow, the current pressure in supersaturation track can be alleviated to a certain extent, improve intersection capacity

2. intersection equipment is installed

Video-based vehicle detection for recording each track vehicle number being installed in crossing, laying teleseme and signal lamp that signal computer for controlling program is housed, and utilizing optical cable and electric wire detecting device and teleseme to be coupled together successively; On changeable driveway, lay pre-signal lamp and variable surface mark simultaneously.

Video-based vehicle detection is arranged on directly over entrance driveway, is positioned at the position of before stop line 20 to 200 meters, and shooting enters the vehicle of entrance driveway, utilizes the vehicle number on each track of video identification technology record; Teleseme, according to the vehicle number of video-based vehicle detection record, adopts computer program to calculate the green light duration of 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 executes the solid white line of drawing width 0.15 meter, and lay 1 meter wide green colored road surface, centre position, two ends, track arranges the changeable driveway symbol word marking of one group of two ends with yellow arrows respectively.

Pre-signal lamp is arranged on the section, upstream of changeable driveway, general conventional changeable driveway there is situation under, entrance driveway solid line length is 20 meters, pre-signal lamp be arranged on apart from stop line 45 meters sentence ensure vehicle shift to an earlier date acknowledge(ment) signal prompting, by driveway travel directions mark indicated direction pass through.

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), Through Lane and left turn lane desirable 1650pcu/h, 1550pcu/h in signalized intersections base saturation flow.

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

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

Fig. 3 is changeable driveway traffic direction is entrance driveway schematic diagram during craspedodrome, as shown in Figure 3, when 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, realize in figure representing bright light, dotted line represents not bright light.

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

Fig. 4 is changeable driveway traffic direction is entrance driveway schematic diagram during left-hand rotation, as shown in Figure 4, when 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 representing bright light, dotted line represents not bright light.

5. the determination of intersection signal timing scheme correlation parameter.

1) determination of total losses time

The computing formula of total losses time is:

$L=\underset{i=0}{\overset{m}{\Σ}}(l_i+I_i-A_i)$

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

I _i: copper sulfate basic, namely 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) determination of maximum flow ratio

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

3) determination of number of phases

In the crossing having changeable driveway, owing to turning left to let pass in different phase places from through vehicles, do not consider the impact of right-turning vehicles on crossing, can determine that this crossing is that four phase signals control, 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: eastern import (street, safety West) 7 import tracks (left-hand rotation three, craspedodrome three, right-hand rotation one), western import (Chegongzhuang Dajie) 7 entrance driveway (left-hand rotation three, craspedodrome three, right-hand rotation one), southing mouth (Fuchengmenbei Dajie) 6 entrance driveway (left-hand rotation two, craspedodrome two, right-hand rotation two), northing mouth (Xizhimennan Dajie) 6 entrance driveway (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), (50s) is turned left in north and south import.

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

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

Intersection vehicles mean delay when table 2 changeable driveway direction is for keeping straight on

Intersection vehicles mean delay when table 3 changeable driveway direction is for turning left

As can be seen from the above table, carry out after Lane use control, the delay of left turning vehicle obtains reduction, but decreases a track due to craspedodrome wagon flow, and its delay increases, but increasing degree is little.Can according to comprehensively incuring loss through delay index resultant effect before and after changeable driveway change can be obtained, as shown in table 4.

Intersection vehicles mean delay before and after the change of table 4 changeable driveway

As can be seen from the above table, changeable driveway is set after comprehensively incur loss through delay reduction.Therefore, after left-hand rotation and craspedodrome wagon flow unbalanced peak time arrange changeable driveway, traffic circulation is obviously effect improved, 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 characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.

Claims (6)

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

Step 1, be at least the entrance driveway of Four-Lane Road, detecting device for recording each track vehicle number is set, 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, calculates the mean delay time in entrance driveway left-hand rotation direction and craspedodrome direction described in each, if an entrance driveway left-hand rotation direction is incured loss through delay comparatively large, and its adjacent Through Lane traffic capacity residue, then changeable driveway is set at this craspedodrome entrance driveway;

Step 3, this ground variable lane sign periodically arranging this changeable driveway is craspedodrome direction, this teleseme starts this changeable driveway traffic direction and judges, this entrance driveway craspedodrome flow of the last cycle detected by this detecting device and left-hand rotation flow, thus judge the traffic direction of this changeable driveway in next cycle, if q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)]≤0, then next variable period track traffic direction continues to keep keeping straight on; If q _l/ [S _l(n _l+ 1)]-q _t/ [S _t(n _t+ 1)] > 0, then next variable period track traffic direction is for turning left, 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 fixes exclusive left-turn lane number, n _t: entrance driveway fixes special straight driving number of channels, and 1: the number of track-lines of changeable driveway, S _l: the track saturation volume of left-hand rotation dedicated Lanes, S _t: the track saturation volume of craspedodrome dedicated Lanes;

Step 4, adjusting the signal timing dial of described crossing, if changeable driveway traffic direction is for keeping straight on, running signal timing dial when changeable driveway traffic direction is craspedodrome, if changeable driveway traffic direction is for turning left, run signal timing dial when changeable driveway traffic direction is left-hand rotation.

2. as claimed in claim 1 based on the intersection signal control method of changeable driveway, 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 to be located at before this entrance driveway stop line 25 ~ 200 meters, this pre-signal lamp is laid in, 45 meters, this entrance driveway upstream, and this ground variable lane sign is laid in this changeable driveway region.

3. as claimed in claim 1 based on the intersection signal control method of changeable driveway, it 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 in each this entrance driveway left-hand rotation direction and craspedodrome direction, in formula, crossing phase place vehicles average delay, C: the signal period is long, u: phase place split, y: phase place throughput ratio, x: phase place saturation degree, q: vehicle arriving rate.

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

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

Calculating maximum flow compares:

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

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

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

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

Calculate the signal period:

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

In formula, C _t: intersection signal cycle duration when changeable driveway direction is for keeping straight on;

L: total losses time, be each phase place vehicle launch lost time and street lamp interval time and yellow time difference summation;

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

4: number of phases, four phase signal crossings;

Calculate each phase place effective green time:

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

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

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

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

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 entrance driveway adjacent with changeable driveway of the last cycle that detecting device detects;

Q ₄: left turn lane maximum flow in entrance driveway adjacent with changeable driveway of the 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, and described phase place is four phase places, and this changeable driveway traffic direction is that when turning left, signal timing dial is:

Calculating maximum flow compares:

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

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

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

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

Calculate the signal period:

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

In formula, C _l: intersection signal cycle duration when changeable driveway direction is for turning left;

L: total losses time, be each phase place vehicle launch lost time and street lamp interval time and yellow time difference summation;

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:

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

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

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

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

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 entrance driveway adjacent with changeable driveway of the last cycle that detecting device detects;

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