CN101159097A - Signal coordinating control method of one-road one-line straightgoing type public transport system - Google Patents

Abstract

The invention relates to a signal coordination control method of a one-road and one-line direct movement type public transportation system and reaches the object that public traffic vehicles fully utilize the waiting time and the transit time during the course that the public traffic vehicles pass through crossings under 'the mode of one-road and one-line direct movement' through the coordinative control of all traffic signal lamps and the corresponding regulation of transit operation to improve transit efficiency of the public traffic vehicles and reduce the delay time of the public traffic vehicles. The concrete method is that signal period lengths Ci of all the crossings are calculated; a key signal period length C0 is identified and taken as the key signal period length of all the crossings; all corresponding split/green ratio Lambadas <j>i=y<j>/ sigma y<j>i of all the crossings are calculated; a bus line equivalent distance map which takes an X-coordinate as an equivalent distance axis and takes a Y-coordinate as a time axis is established; bus line direction green light starting time differences between terminal departure stations and initial departure stations or between the signal crossings and bus line direction maximum green time length are identified through a method of 'graphical solution' is improved; therefore, a public traffic vehicle dispatching time is identified.

Description

The signal coordinating control method of one-road one-line straightgoing type public transport system

Technical field

The present invention relates to public transit vehicle is carrying out under " one-road-one-line straight-going mode ", by the coordination control of each traffic lights and the corresponding adjustment of bus dispatching, stand-by period and transit time when realization makes full use of public transit vehicle through each crossing, to reach the traffic efficiency that improves public transit vehicle, reduce the delay time at stop of public transit vehicle, belong to the urban road transportation control field.

Background technology

" one-road-one-line straight-going mode " is meant that the public bus network setting is benchmark with the road, and a road is only laid a public bus network in principle, and public transit vehicle is along the road straight-line travelling, public transport network and urban road network's pattern basically identical; Bus stop is arranged on crossing, near stop line, realizes that " seamless " of different directions public bus network is connected, and is convenient to passenger's transfer, helps improving the efficiency of operation of public transit vehicle, is convenient to the bus passenger trip.

Yet the superiority of " One-road one-line straight movement type " public transit system operation only can not be brought into play even can't embody to the foundation of " One-road one-line straight movement type " public transit system during being provided with of planning by public transport network and public transportation lane to greatest extent.

Through inventor's discovery that studies for a long period of time, its main cause is public transit vehicle by way of signalized intersections the time, and acquisition right-of-way that can not be in good time causes public transit vehicle in the crossing susceptible to, can't pass through smoothly.If can be by the line traffic control mode of traffic lights, adjust that public transit vehicle is stopped, the relation of current and traffic lights timing parameter, then can improve the traffic efficiency of public transit vehicle when signalized intersections greatly, thus the whole public transit system operation ability that improves under " one-road-one-line straight-going mode ".

Summary of the invention

Technical matters: the signal coordinating control method that the purpose of this invention is to provide a kind of one-road one-line straightgoing type public transport system, do not changing under " one-road-one-line straight-going mode " of public transit vehicle, by adjusting the signal timing dial parameter of public transit vehicle by way of signalized intersections, design is fit to the current line traffic control mode of public transit vehicle.When satisfying the normal operation of signalized intersections, make full use of the traffic light signal duration of signal lamp, reduce the influence that signal lamp travels to public transit vehicle, improve " one-road-one-line straight-going mode " operational efficiency of public transit vehicle down.

Technical scheme: for achieving the above object, the signal coordinating control method of one-road one-line straightgoing type public transport system of the present invention is performed such:

1. the volume of traffic of each crossing out of phase, interval S between the public transport first and last starting station, each crossing are determined in) control program initialization _i, the position of bus stop, the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing

2.),, calculate the signal period length C of each crossing by Robert Webster signal timing dial computing method commonly used according to the volume of traffic of each crossing _i,

3.) the signal period length C of each crossing _i, the public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing

Determine key signal Cycle Length C ₀, and with key signal Cycle Length C ₀As the signal period length of each crossing,

4.) according to the flow rate ratio y of each crossing out of phase key flow _i ^j, by Robert Webster signal timing dial computing method commonly used, calculate the split of each phase place of crossing ${\mathrm{\&lambda;}}_i^j=y_i^j/\underset{j}{\mathrm{\&Sigma;}}{y}_i^j,$ And according to each intersection signal Cycle Length C _i, determine the shortest green light length of each phase place of each crossing $G_i^j\text{=}{C}_i\&CenterDot;{\mathrm{\&lambda;}}_i^j;$ Wherein, G _i ^jJ phase place green light length representing i crossing, y _i ^jThe volume of traffic of representing j phase place key flow of i crossing, λ _i ^jJ phase place split representing i crossing,

5.) according to interval S between the public transport first and last starting station, each crossing _i, bus stop position, the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time Setting up horizontal ordinate is distance axis of equal value, and ordinate is the public bus network of a time shaft distance map of equal value,

6.) according to public bus network distance map of equal value, key signal Cycle Length C ₀, the shortest green light length of each phase place of each crossing G _i ^j, by improving " graphical method ", determine that public bus network direction green light between the first and last starting station, each signalized intersections starts maximum length when green of the time difference and public bus network direction,

7.) according to the signal coordinating controlled variable of having set up by above-mentioned steps, distance of equal value, public transit vehicle average overall travel speed, intersection signal key signal Cycle Length C ₀And the public transit vehicle cycle request of dispatching a car, determine the public transit vehicle scheduling constantly.

Determine key signal Cycle Length C ₀Not only need to consider the volume of traffic of each crossing, also will consider simultaneously public transit vehicle passenger and the demand by the crossing up and down, be specially:

1.) compare each intersection signal Cycle Length C _i, determine that the longest crossing of signal period is crucial crossing, its signal period length is the alternative signal Cycle Length $C_0^{\&prime;}=\underset{i}{\max }{C}_i,$

2.) according to alternative signal Cycle Length C ₀', the public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing Calculate the key signal Cycle Length $C_0=\max (C_0^{\&prime;},{\stackrel{\&OverBar;}{T}}_{\mathrm{delay}}+{\stackrel{\&OverBar;}{T}}_{\mathrm{pass}}),$

3.) with key signal Cycle Length C ₀Signal period length as each crossing.

Public bus network distance map of equal value is set up, and is in the public bus network distance map of reality, according to the position of bus stop, inserts the position of virtual crossing, is specially:

1.) according to the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time Calculate operating range of equal value $L=\stackrel{\&OverBar;}{v}*{\stackrel{\&OverBar;}{T}}_{\mathrm{delay}},$

2.) in the distance map of equal value, each up direction place with crossing n of bus stop is inserted a virtual crossing Make crossing n and virtual crossing

Spacing be operating range L of equal value, virtual crossing With the spacing of next crossing n+1 be the actual pitch of crossing n and next crossing n+1.The method that improved " graphical method " found the solution is:

1.) initialization based on public bus network distance map of equal value, is determined distance between the first and last starting station, crossing, the virtual crossing, sets actual crossing n and corresponding virtual crossing with bus stop

Have identical signal controlling parameter,

2.) in graphical analysis procedure, with public transit vehicle the average velocity of dedicated bus lanes as along public bus network current pass through tape speed, be made as starting point with first starting station public transit vehicle frequency, set up an oblique line a who is equivalent to by tape speed, according to virtual crossing with bus stop With constraint conditions such as the position of the crossing that does not have bus stop, signal period duration, Minimum Green Time, adjust the signal green light length and the green light time difference, search for an oblique line a ' parallel with oblique line a, scope between oblique line a and the oblique line a ' can be passed through smoothly in each crossing, not influenced by the crossing red signal, obtain the green wave width of up public transit vehicle, i.e. vertical direction distance between oblique line a and the oblique line a '

3.) in step 2) on the signal green light length and the basis of the green light time difference that obtain, according to actual crossing n with there is not the position of the crossing of bus stop with bus stop, readjust the signal green light length and the green light time difference, obtain the green wave width of descending public transit vehicle

4.), adjust the green light length of each crossing and the green light time difference between the crossing, seek the up-downgoing public transit vehicle and can obtain maximum green wave width by enumerative technique.

Determine that public transit vehicle scheduling is constantly based on the signal controlling parameter that forms and the public transit vehicle cycle requirement of dispatching a car:

1.) judge with adjacent signals crossing, the first starting station of public transport whether have bus stop, if exist then according to distance map of equal value, determine the distance between the virtual crossing of the first starting station of public transport and adjacent signals crossing, as the equivalence distance between the public transport head starting station and the adjacent signals crossing

Otherwise, then with the actual range between the first starting station of public transport and the adjacent signals crossing as between the two equivalence distance

2.) according to distance of equal value

With the bus average overall travel speed

Calculate the time offset value of public transit vehicle between first starting station frequency and the startup constantly of adjacent crossing public bus network direction green light $\mathrm{\&Delta;}=\tilde{S}/\stackrel{\&OverBar;}{v},$

3.) start T constantly according to adjacent crossing public bus network direction green light ₀With the time offset value Δ, determine the frequency T=T of the one class of public transit vehicle in the first starting station of public bus network ₀-Δ, and with this as first starting station benchmark frequency,

4.) according to first starting station benchmark frequency T, intersection signal cycle C ₀, can determine the frequency T ± mC of other order of classes or grades at school public transit vehicles of the first starting station ₀, the cycle length of wherein dispatching a car is by the decision of the value of integer m,

5.) the public transit vehicle frequency at the last starting station determines that method determines that with the first starting station public transit vehicle frequency method is identical.

Beneficial effect: the present invention compared with prior art has the following advantages:

1. improve under " one-road-one-line straight-going mode " arrival rate on schedule of vehicle.By coordination control, guarantee that public transit vehicle when needs pass through the crossing, can obtain the crossing right-of-way smoothly to crossing signal parameter on the public bus network.Reduce public transit vehicle and incur loss through delay, reduce the influence factor of public transit vehicle, be convenient to improve the arrival rate on schedule of public transit vehicle at signalized intersections.

2. improve under " one-road-one-line straight-going mode ", the public transit vehicle bus stop is arranged on intersection parking line place, coordination control by the intersection signal parameter, can make public transit vehicle in crossing with bus stop, make full use of the red time of signal lamp, be used for passenger up and down, null resource when rationally utilizing traffic, the efficiency of operation of raising public transit vehicle.

3. under " one-road-one-line straight-going mode ",, can make the implementation result of present technique more remarkable by the coordination control of traffic signals and the setting of public transportation lane.

Description of drawings

Fig. 1 is " one-road-one-line straight-going mode " signal coordinating control technology basic flow sheet down.

Fig. 2 is " one-road-one-line straight-going mode " public bus network synoptic diagram down.

Fig. 3 is improved green ripple control " graphical method " synoptic diagram.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described:

Because under " one-road-one-line straight-going mode ", a road is only laid a public bus network in principle, therefore, on this road direction, each intersection signal lamp parameter designing only need be thought of as the current smoothly of a public bus network.Article one, public bus network is made up of the uplink and downlink bidirectional line, and therefore, being provided with of intersection signal lamp parameter mainly is to design at two-way road.

A, two-way road intersection signal lamp controlled variable are set

Two-way road intersection signal lamp controlled variable is set signal period, the green light length of public bus network direction, each signalized intersections public bus network direction green light of mainly comprising each signalized intersections and is started the time difference etc.By determining of above-mentioned 3 controlled variable, then can realize under " one-road-one-line straight-going mode " control of signalized intersections signal coordinating.

A. determine that public bus network is by way of the signal period of each signalized intersections duration

1.) incur loss through delay minimum as the traffic performance indicator,, calculate the signal period duration C of each signalized intersections respectively by Robert Webster model (Webster model) commonly used in the traffic signals control technology with each signalized intersections gross vehicle _i

2.) compare each signalized intersections picked up signal cycle duration C _i, with the signalized intersections of required cycle duration maximum as the crucial crossing on the public bus network, and with this cycle duration as alternative signal cycle duration C ₀'.

3.) judge alternative signal cycle duration C ₀' whether satisfy the key signal cycle duration C of " one-road-one-line straight-going mode " ₀Requirement.Public transit vehicle under " one-road-one-line straight-going mode " is to utilize crossing, the place ahead public bus network direction to show red time, is used for passenger about bus stop; And, pass through the crossing smoothly showing green time.Therefore, key signal cycle duration C ₀Need incur loss through delay greater than public transit vehicle bus stop time average

With by the required duration in crossing Sum.

4.) determine key signal cycle duration C ₀Afterwards, the signal period duration unification with each signalized intersections on the public bus network is key signal cycle duration C ₀

B. determine the green light length of each signalized intersections public bus network direction

1., determine the split of each crossing out of phase signal) according to Robert Webster signal timing dial computing method commonly used in the traffic signals control technology.

2.) each signalized intersections signal period duration C _iWith the split of out of phase signal, calculate the shortest green light length of each each phase place of crossing.

3.) according to key signal cycle duration C ₀With each signalized intersections signal period duration C _i, determine the recruitment of each intersection signal Cycle Length under the prerequisite of the shortest green light length that satisfies each each phase place of crossing, to prolong public bus network direction green light length as far as possible, determining of the maximum green light length of public bus network direction can be by c.5.) obtain.

C. determine the phase differential of public bus network by way of each signalized intersections

The phase place method for determining difference of each signalized intersections needs to improve according to " one-road-one-line straight-going mode " based on graphical method:

1.) determine on the public bus network distance between the first and last starting station, each signalized intersections, and public transit vehicle average overall travel speed.

2.) determine to have the signalized intersections position of bus stop, and the public transit vehicle bus stop mean delay time.

3., obtain the operating range L of equal value that public transit vehicle can travel in the bus stop mean delay time) according to public transit vehicle average overall travel speed and public transit vehicle bus stop mean delay time.Determine the position of corresponding virtual crossing according to the position, crossing with bus stop and operating range L of equal value.

4., set up and be convenient to the distance map of equal value that improved " graphical method " found the solution) according to the equivalence distance between the first and last starting station, each signalized intersections, the virtual crossing.

5., calculate under two-way road conditions length when the public bus network direction green light startup time difference between the first and last starting station, each signalized intersections and public bus network direction maximum are green) according to improved " graphical method " and distance map of equal value.

Under B, " one-road-one-line straight-going mode ", the bus dispatching coordination parameter is set

Under " one-road-one-line straight-going mode ", the coordination of intersection signal parameter control also needs to adapt with bus dispatching, could finally realize the signal coordinating control of " one-road-one-line straight-going mode " public transit system.

1. signalized intersections that) will be adjacent with the public bus network first and last starting station is as " accurate starting point ", and starts constantly as reference point with " accurate starting point " public bus network direction green light.

2.) according to the distance of the public bus network first and last starting station and adjacent crossing, and the public transit vehicle average overall travel speed, calculate the frequency of the first public transit vehicle in the public bus network first and last starting station, and with this as the benchmark frequency.

3.) according to benchmark frequency, intersection signal cycle C ₀And the requirement of public transit vehicle departure frequency, determine the frequency of public transit vehicle.

Example: as shown in Figure 2, establish this public bus network and be " one-road-one-line straight-going mode ", only lay a public bus network on this road, public transport is travelled along the public transportation lane of this road.The first and last starting station of public bus network is respectively A, B 2 points, is uplink by A point-B point, is downgoing line by B point-A point.Public bus network goes out to be provided with the bus stop point 3 crossings near stop line altogether, and the crossing is respectively: crossing I, crossing II and crossing IV.

Signal coordinating control at " one-road-one-line straight-going mode " draws the average velocity 32km/h of public transit vehicle at dedicated bus lanes through investigation, and the public transit vehicle bus stop on-board and off-board mean delay time is 45s.Suppose that two phase place control is adopted in each crossing between A, the B point, and volume of traffic demand is identical, the signal period of each crossing is 80s, and the minimum green light length of each phase place is 40s.Therefore, the signal period of each crossing need not to prolong, and the green light length of each phase place can't increase and decrease, and causes signal coordinating control only can realize the signal coordinating control of " one-road-one-line straight-going mode " by public bus network by way of the phase differential of each signalized intersections.

By improved green ripple control " graphical method ", find the solution the signal coordinating controlling schemes under " one-road-one-line straight-going mode ".At first need set up distance map of equal value, in the distance axis direction, according to bus stop point position, newly-built virtual crossing I ', virtual crossing II ' and virtual crossing IV ', virtual crossing is in full accord with the signal timing dial parameter between the actual crossing, and spacing between the two is by the decision of average velocity on-board and off-board mean delay time of public transit vehicle.Adopting improved green ripple control " graphical method " when finding the solution, uplink (A point-B point) according to crossing time-distance relations such as virtual crossing I ', virtual crossing II ', crossing III and virtual crossing IV ', is found the solution the signal controlling parameter; Downgoing line (B point-A point) according to crossing I, crossing II, crossing III and crossing IV etc., is found the solution the signal controlling parameter:

Table 1 intersection signal is coordinated controlled variable

Title	Spacing	The time of departure	Public bus network direction green light starts constantly	Public bus network direction green light length	The intersection signal Cycle Length
						First starting station A		00 minute 00 second
Crossing I	200 meters		01 minute 30 seconds	40 seconds	80 seconds
						Crossing II	230 meters		02 minute 58 seconds	40 seconds	80 seconds
Crossing III	100 meters		03 minute 12 seconds	40 seconds	80 seconds
						Crossing IV	150 meters		04 minute 15 seconds	40 seconds	80 seconds
End starting station B	220 meters	00 minute 00 second

Annotate: with first starting station time of departure be etalon time, be made as 00 minute and 00 second.

Determine then can determine the coordination controlled variable of signal lamp after the mutual relationship between each crossing public bus network direction green light startup constantly.The time of departure of the bus at the starting station then can be according to calculating acquisition with the time interval of adjacent crossing in the last table.Only need the requirement according to the public transit vehicle departure frequency time of departure at interval, and the integral multiple that the cycle of dispatching a car is set to the key signal cycle gets final product.

Claims (5)

1. the signal coordinating control method of an one-road one-line straightgoing type public transport system is characterized in that this control procedure controlled by computing machine, and its concrete grammar is:

1. the volume of traffic of each crossing out of phase, interval S between the public transport first and last starting station, each crossing are determined in) control program initialization _i, the position of bus stop, the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing

2.),, calculate the signal period length C of each crossing by Robert Webster signal timing dial computing method commonly used according to the volume of traffic of each crossing _i,

3.) the signal period length C of each crossing _i, the public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing

Determine key signal Cycle Length C ₀, and with key signal Cycle Length C ₀As the signal period length of each crossing,

4.) according to the flow rate ratio y of each crossing out of phase key flow _i ^j, by Robert Webster signal timing dial computing method commonly used, calculate the split of each phase place of crossing ${\mathrm{\&lambda;}}_i^j=y_i^j/\underset{j}{\mathrm{\&Sigma;}}{y}_i^j,$ And according to each intersection signal Cycle Length C _i, determine the shortest green light length of each phase place of each crossing $G_i^j\text{=}{C}_i\&CenterDot;{\mathrm{\&lambda;}}_i^j$ Wherein, G _i ^jJ phase place green light length representing i crossing, y _i ^jThe volume of traffic of representing j phase place key flow of i crossing, λ _i ^jJ phase place split representing i crossing,

5.) according to interval S between the public transport first and last starting station, each crossing _i, bus stop position, the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time Setting up horizontal ordinate is distance axis of equal value, and ordinate is the public bus network of a time shaft distance map of equal value,

6.) according to public bus network distance map of equal value, key signal Cycle Length C ₀, the shortest green light length of each phase place of each crossing G _i ^j, by improving " graphical method ", determine that public bus network direction green light between the first and last starting station, each signalized intersections starts maximum length when green of the time difference and public bus network direction,

7.) according to the signal coordinating controlled variable of having set up by above-mentioned steps, distance of equal value, public transit vehicle average overall travel speed, intersection signal key signal Cycle Length C ₀And the public transit vehicle cycle request of dispatching a car, determine the public transit vehicle scheduling constantly.

2. the signal coordinating control method of a kind of one-road one-line straightgoing type public transport system according to claim 1 is characterized in that determining key signal Cycle Length C ₀Not only need to consider the volume of traffic of each crossing, also will consider simultaneously public transit vehicle passenger and the demand by the crossing up and down, be specially:

1.) compare each intersection signal Cycle Length C _i, determine that the longest crossing of signal period is crucial crossing, its signal period length is the alternative signal Cycle Length $C_0^{\&prime;}=\underset{i}{\max }{C}_i,$

2.) according to alternative signal Cycle Length C ₀', the public transit vehicle bus stop on-board and off-board mean delay time

With by the average duration in crossing

Calculate the key signal Cycle Length $C_0=\max (C_0^{\&prime;},{\stackrel{\&OverBar;}{T}}_{\mathrm{delay}}+{\stackrel{\&OverBar;}{T}}_{\mathrm{pass}}),$

3.) with key signal Cycle Length C ₀Signal period length as each crossing.

3. the signal coordinating control method of a kind of one-road one-line straightgoing type public transport system according to claim 1, it is characterized in that public bus network distance map foundation of equal value, is in the public bus network distance map of reality, according to the position of bus stop, insert the position of virtual crossing, be specially:

1.) according to the average overall travel speed of public transit vehicle

The public transit vehicle bus stop on-board and off-board mean delay time Calculate operating range of equal value $L=\stackrel{\&OverBar;}{v}*{\stackrel{\&OverBar;}{T}}_{\mathrm{delay}},$

2.) in the distance map of equal value, each up direction place with crossing n of bus stop is inserted a virtual crossing

Make crossing n and virtual crossing

Spacing be operating range L of equal value, virtual crossing

With the spacing of next crossing n+1 be the actual pitch of crossing n and next crossing n+1.

4. the signal coordinating control method of a kind of one-road one-line straightgoing type public transport system according to claim 1 is characterized in that the method that improved " graphical method " found the solution is:

1.) initialization based on public bus network distance map of equal value, is determined distance between the first and last starting station, crossing, the virtual crossing, sets actual crossing n and corresponding virtual crossing tool with bus stop

Identical signal controlling parameter is arranged,

2.) in graphical analysis procedure, with public transit vehicle the average velocity of dedicated bus lanes as along public bus network current pass through tape speed, be made as starting point with first starting station public transit vehicle frequency, set up an oblique line a who is equivalent to by tape speed, according to virtual crossing with bus stop

With constraint conditions such as the position of the crossing that does not have bus stop, signal period duration, Minimum Green Time, adjust the signal green light length and the green light time difference, search for an oblique line a ' parallel with oblique line a, scope between oblique line a and the oblique line a ' can be passed through smoothly in each crossing, not influenced by the crossing red signal, obtain the green wave width of up public transit vehicle, i.e. vertical direction distance between oblique line a and the oblique line a '

3.) in step 2) on the signal green light length and the basis of the green light time difference that obtain, according to actual crossing n with there is not the position of the crossing of bus stop with bus stop, readjust the signal green light length and the green light time difference, obtain the green wave width of descending public transit vehicle

4.), adjust the green light length of each crossing and the green light time difference between the crossing, seek the up-downgoing public transit vehicle and can obtain maximum green wave width by enumerative technique.

5. the signal coordinating control method of a kind of one-road one-line straightgoing type public transport system according to claim 1 is characterized in that determining that the public transit vehicle scheduling is constantly based on the signal controlling parameter that forms and the public transit vehicle cycle requirement of dispatching a car:

1.) judge with adjacent signals crossing, the first starting station of public transport whether have bus stop, if exist then according to distance map of equal value, determine the distance between the virtual crossing of the first starting station of public transport and adjacent signals crossing, as the equivalence distance between the public transport head starting station and the adjacent signals crossing

Otherwise, then with the actual range between the first starting station of public transport and the adjacent signals crossing as between the two equivalence distance

2.) according to distance of equal value

With the bus average overall travel speed Calculate the time offset value of public transit vehicle between first starting station frequency and the startup constantly of adjacent crossing public bus network direction green light $\mathrm{\&Delta;}=\tilde{S}/\stackrel{\&OverBar;}{v},$

3.) start T constantly according to adjacent crossing public bus network direction green light ₀With the time offset value Δ, determine the frequency T=T of the one class of public transit vehicle in the first starting station of public bus network ₀-Δ, and with this as first starting station benchmark frequency,

4.) according to first starting station benchmark frequency T, intersection signal cycle C ₀, can determine the frequency T ± mC of other order of classes or grades at school public transit vehicles of the first starting station ₀, the cycle length of wherein dispatching a car is by the decision of the value of integer m,

5.) the public transit vehicle frequency at the last starting station determines that method determines that with the first starting station public transit vehicle frequency method is identical.

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