CN109035807A - Road grade crossing Two-phases signal controls complete red time calculation method - Google Patents
Road grade crossing Two-phases signal controls complete red time calculation method Download PDFInfo
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
Abstract
The invention discloses a kind of road grade crossing Two-phases signals to control complete red time calculation method, method includes the following steps: dividing the period；Traffic study is organized, crucial traffic data is obtained；Highway traffic data is analyzed, type of vehicle is divided；Calculate the average length of wagon vh of type of vehicle ccWith traffic impact coefficient impc；Calculate the shortest distance d that vehicle must pass through in complete red timee,c；It calculates each car i and passes through shortest distance de,cRequired time；It calculates vehicle and passes through the frequency distribution of t the time required to the shortest distance；Determine the threshold value Fr of complete red time cumulative frequency；Calculate complete red time Rrn,ph；The present invention has fully considered that different time sections traffic composition and speed have very big otherness；Also contemplate different vehicle type traffic impact, speed and in terms of having differences property, actual demand can be met more accurately.
Description
Technical field
The present invention relates to traffic engineering technical fields, and in particular to a kind of road grade crossing Two-phases signal control is complete
Red time calculation method.
Background technique
Signal control is one of the technical way in traffic engineering field, for alleviating the traffic of road grade crossing
Pressure improves service level and traffic safety, plays an important role.Two-phases signal control is the common shape of traffic control
The basis of formula and Multi-phase signalization.When the volume of traffic of road grade crossing is relatively low, when turning traffic is less big,
Generally use two phase place control., left-turning traffic bigger for traffic pressure is serious compared with the conflict of opposite straight-going traffic
Road grade crossing can add left turn phase on the basis of Two-phases signal control program, form the signal of leggy
Control.Therefore, the related technology that Two-phases signal controls is expanded slightly, Multi-phase signalization can be applied to.
Complete red time is also known as cleared out a gathering place the time, is one of basic parameter of traffic signalization, and whether value is rationally right
There is important influence in traffic safety." complete red " indicates a kind of state that all signal lamps are all displayed in red, in this state,
The vehicle for having passed over stop line will speed away intersection, begin a clean up potential conflict for next signal phase, carry out
Preparation.Therefore, complete red time is to be connected the crucial moment of former and later two phases.Complete red time is too short, will lead to last phase
The vehicle for entering intersection during the position green light end of term or amber light cannot empty in time, bring danger to the operation of next phase.
Complete red time is too long, then can induce illegal driver and make a dash across the red light in complete red period；In addition, can also bring the excessively high loss of signal
Time cuts down the capacity and level-of-service of control signal path level-crossing.
Existing road grade crossing signal control complete red time calculation method mainly passes through analysis Vehicle Speed
Cumulative distribution curve determine the speed that can be referred to, then calculate under this speed vehicle it is necessary by intersection when
Between, this is complete red time.The method is simple, easy, is widely used.However, this method does not account for traffic flow
Time varying characteristic and its influence to Vehicle Speed and complete red time；In addition, this method is also different types of without distinguishing
Vehicle length of wagon, travel speed and in terms of otherness.On existing complete red time calculation method is existing
Stating defect makes it be difficult to accurately calculate the complete red time to hold water according to the actual conditions of traffic flow.
The a large amount of Research Literature in traffic engineering field shows that road traffic system is the complex gigantic system of dynamic change, no
Only the volume of traffic has huge variation in one day different time sections, so that the speed to vehicle also has an impact, traffic composition
Also change frequent occurrence, leading to ratio shared by all types of vehicles of section in different times, there is also very big differences.And it is different
The vehicle of type has the difference that can't be ignored in terms of its physical features and traffic characteristic.For example, oversize vehicle is because its is huge
Body and more influences are brought on other vehicles.If be trapped in intersection because of accidental cause, oversize vehicle is by band
Carry out bigger traffic problems.Therefore, different types of vehicle should treat with a certain discrimination, when preferably to design reasonable complete red
Between calculation method.
In view of existing signal control complete red time calculation method there are the shortcomings that, and the traffic flow of road grade crossing
With extremely complex dynamic change, the calculating of signal control complete red time is affected, from the function of signal control complete red time
It sets out with effect, complete red time calculating can be controlled more responsive to the signal of traffic flow feature complicated and changeable by how designing one kind
Method will be the major reform and progress of this field.
Summary of the invention
Technical problem: for overcome the deficiencies in the prior art, the present invention provides a kind of road grade crossing two phase place letter
Number control complete red time calculation method, this method can effectively solve the defect that the prior art is simple, coarse, can be more fine
The feature of the changeable complexity of road intersection accidents stream is analyzed on ground, and accurately calculates the complete of its Two-phases signal control accordingly
The red time.The thought and method of the invention can be promoted easily, to adapt to multiphase traffic signal control.
Technical solution:
Road grade crossing Two-phases signal controls complete red time calculation method, which is characterized in that specifically includes following
Step:
Step 1, it was divided into N number of period by one day, wherein N takes positive integer；
Step 2, if there be E entrance driveway in intersection, harpoon hands over the road of each period n, each entrance driveway e respectively
Logical investigation, wherein 1≤n≤N, 1≤e≤E obtain the highway traffic data of each period, each entrance driveway；
Step 3, the highway traffic data that analytical procedure 2 obtains, and type of vehicle is divided into C class；
Step 4, for every kind of type of vehicle c, wherein 1≤c≤C calculates the average length of wagon of every kind of type of vehicle c
vhcWith traffic impact coefficient impc；
Step 5, for each entrance driveway e, every kind of type of vehicle c, the vehicle for calculating type c must lead in complete red time
The shortest distance d crossede,c；
Step 6, it for each period n, each entrance driveway e, every kind of type of vehicle c, calculates each car i and passes through most short distance
From de,cRequired time t (i, c, e, n)；
Step 7, for each period n, each entrance driveway e, according to traffic impact coefficient impcVehicle is calculated by most
The frequency distribution of t the time required to short distance；
Step 8, the threshold value Fr of complete red time cumulative frequency is determined；
Step 9, the complete red time Rr of each period n, each phase ph are calculatedn,ph, 1≤n≤N, ph=1,2.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
One day time according to the traffic characteristic of the road grade crossing, was divided into N number of period, example in step 1 by case
Such as: morning peak period, evening peak period, flat peak time section, low ebb period.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case, in step 2, key road traffic data includes following aspect: vehicle sequence in the queue, vehicle length of wagon,
Travel speed of the vehicle near stop line.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case analyzes length of wagon index, and carry out clustering accordingly, the vehicle of investigation is divided into C class in step 3.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case for every kind of type of vehicle c, 1≤c≤C, calculates its average length of wagon in step 4Wherein, NcIt is the vehicle number for belonging to type c, vhcIt (i) is i-th vehicle for belonging to type c
Length of wagon, 1≤i≤Nc。
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case, in step 4, for every kind of type of vehicle c, 1≤c≤C, according to its length of wagon vh that is averagedcCalculate its traffic impact system
NumberWherein, vhmin=min (vh1,vh2,…,vhC), Round () represents bracket function.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case for each entrance driveway e, every kind of type of vehicle c, calculates its most short distance that must pass through in complete red time in steps of 5
FromWherein, vhcIt is the average length of wagon of c type of vehicle, w1It is the machine of entrance driveway e
Motor-car stop line and nearest the distance between road intersection driveway edge line, w2It is two outside garage roadsides of road intersection
The distance between edge line, impcIt is the traffic impact coefficient of c type of vehicle, impmax=max (imp1,imp2,…,impC)。
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case for each period n, each entrance driveway e, every kind of type of vehicle c, calculates each car i and passes through most short distance in step 6
From de,cRequired timeWherein, v (i, c, e, n) be period n, entrance driveway e, type of vehicle c
Speed of the i vehicle near stop line.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case, in step 7, for each period n, each entrance driveway e, according to traffic impact coefficient impcCalculating vehicle passes through most short
Frequency distribution apart from required time t, specifically:
Step 7.1, each car passes through shortest distance de,cRequired time t (i, c, e, n) arrives big sequence from childhood, and merger is
Several groups；
Step 7.2, every data of revised data, type of vehicle c presses impcMultiple counted again；
Step 7.3, calculating group away from and class mean；
Step 7.4, each class frequency is counted；
Step 7.5, cumulative frequencies are calculated；
Step 7.6, frequency and cumulative frequency are calculated；
Step 7.7, it is organized into frequency distribution table；
Step 7.8, histogram frequency distribution diagram is drawn；
Step 7.9, cumulative frequency distribution curve is drawn.
Further preferred side as road grade crossing Two-phases signal of the present invention control complete red time calculation method
Case calculates the complete red time Rr of each period n, each phase ph in step 9n,ph, 1≤n≤N, ph=1,2, specific meter
Calculation process are as follows:
Step 9.1, complete red time Rr needed for determining each period n, each entrance driveway en,e, as its vehicle is by most
Time corresponding to the cumulative frequency distribution curve upper threshold value Fr of t the time required to short distance；
Step 9.2, the complete red time of period n, phase phWherein, EphIndicate that phase ph permits
Perhaps current crossing inlet road set.
The utility model has the advantages that the present invention compared with art methods, has following remarkable advantage:
1, the present invention carries out two-phase on the basis of the condition of road surface and traffic condition of analysis road grade crossing comprehensively
The calculating of position signal control complete red time, can better adapt to the dynamic and complexity of road traffic, be traffic control
Engineering practice provides important analysis tool；
2, the present invention was divided into some time for one day, calculated signal control according to the road traffic features of each period
Complete red time processed can better adapt to the dynamic change of traffic flow；
3, the present invention when calculating complete red time, it is contemplated that different types of vehicle length of wagon, traffic impact coefficient,
The difference of travel speed and the shortest distance that must pass through etc. enables the method to better adapt to complicated traffic feelings
Condition.
Detailed description of the invention
Fig. 1 is that road grade crossing Two-phases signal controls complete red time calculation method flow chart；
Fig. 2 is shortest distance de,cParameter w in calculation formula1And w2Schematic diagram；
Fig. 3 is that Two-phases signal controls major parameter schematic diagram.
Specific embodiment
As shown in Figure 1, method includes the following steps:
S01 is divided into N number of period according to actual needs, by one day time.The road grade crossing is carried out
Preliminary investigation obtains the data in relation to its geometry designs and road traffic condition；Analyze the traffic of the road grade crossing
Feature studies the variation characteristic of its volume of traffic and traffic composition；One day time was divided into some time, for example: early high
Peak time section, evening peak period, flat peak time section, low ebb period etc..During dividing the period, selective analysis is answered
The situation of change of Vehicle Speed.More road grade crossing is changed for traffic condition, it may be considered that divide more
More period, so as to better adapt to the fluctuation of traffic flow.
S02, which sets intersection, E entrance driveway, respectively road traffic of the harpoon to each period n, each entrance driveway e
Investigation, 1≤n≤N, 1≤e≤E obtain the key road traffic data of each period, each road entrance driveway.The data
Including the following aspects: vehicle sequence in the queue, vehicle travel speed near stop line of length of wagon, vehicle
Deng.The speed of former vehicles in queue is usually less than other vehicles, in analysis and calculating hereafter, to reject these numbers
According to.In addition it is also possible to consider to reject a small number of abnormal datas by external interference.
S03 analyzes highway traffic data, studies the otherness that various vehicles show in terms of length of wagon, with poly-
Type of vehicle is divided into C class by alanysis method；It is ranked up according to its length of wagon is ascending, is followed successively by 1,2 ..., C.
It is very broad for road intersection, intersect that open area is larger, road grade crossings of traffic complicated composition, it may be considered that divide
More type of vehicle.Different types of vehicle will have significant otherness between length of wagon, it is proposed that different type vehicle
The difference of average length of wagon is preferably not less than 5 meters.
S04 calculates its average length of wagon for every kind of type of vehicle c, 1≤c≤C
Wherein, NcIt is the vehicle number for belonging to type c, vhcIt (i) is the length of wagon for belonging to i-th vehicle of type c, 1≤i≤Nc；It calculates
Its traffic impact coefficientWherein, vhmin=min (vh1,vh2,…,vhC), Round (), which is represented, to be rounded
Function rounds up a numerical value.
S05 calculates its shortest distance that must pass through in complete red time for each entrance driveway e, every kind of type of vehicle cWherein, vhcIt is the average length of wagon of c type of vehicle；As shown in Fig. 2, w1It is import
The motor vehicle parking line of road e and nearest the distance between road intersection driveway edge line, w2It is two outsides of road intersection
The distance between driveway edge line；impcIt is the traffic impact coefficient of c type of vehicle, impmax=max (imp1,imp2,…,
impC)。
S06 calculates each car i and passes through the shortest distance for each period n, each entrance driveway e, every kind of type of vehicle c
de,cRequired timeWherein, v (i, c, e, n) be period n, entrance driveway e, type of vehicle c i-th
Speed of the vehicle near stop line.During above-mentioned calculating carries out, calculated result is stored classifiedly, it will be same
Period, same entrance driveway data store together, for below the step of be ready.It is recommended that on the side of each calculated result
While marking its type of vehicle.
S07 is for each period n, each entrance driveway e, according to traffic impact coefficient impcIt calculates vehicle and passes through most short distance
Frequency distribution from required time t (i, c, e, n), specifically:
(1) each car passes through shortest distance de,cRequired time t (i, c, e, n) arrives big sequence from childhood, and merger is several
Group；
(2) every data of revised data, type of vehicle c presses impcMultiple counted again；
(3) calculating group away from and class mean；
(4) each class frequency is counted；
(5) cumulative frequencies are calculated；
(6) frequency and cumulative frequency are calculated；
(7) it is organized into frequency distribution table；
(8) histogram frequency distribution diagram is drawn；
(9) cumulative frequency distribution curve is drawn.
During grouping, according to the density degree decision group number of data distribution.If data distribution compares concentration, build
View divides more group numbers and more accurately calculates signal so as to more subtly analyze the situation of change of cumulative frequency
The complete red time of control.
S08 according to actual needs, determines the threshold value Fr of complete red time cumulative frequency.Usually suggest that the threshold value is taken as 85%.
If the diversity ratio of different types of its travel speed of vehicle is larger or vehicle passes through the distribution of t the time required to the shortest distance
More dispersed, threshold value Fr can take a biggish numerical value.The increase of threshold value Fr will lead to step S09 and calculate bigger letter
Number control complete red time.
S09 calculates the complete red time Rr of each period n, each phase phn,ph, 1≤n≤N, ph=1,2, specifically:
(1) complete red time Rr needed for determining each period n, each entrance driveway en,e, as its vehicle passes through the shortest distance
Time corresponding to the cumulative frequency distribution curve upper threshold value Fr of required time t；
(2) complete red time of period n, phase phWherein, EphIndicate that phase ph allows to pass through
Crossing inlet road set.
If the feature of the road grade crossing traffic flow meets the situation when investigation and analysis, pass through above-mentioned side
The Two-phases signal control complete red time that method calculates can achieve following effects: as shown in figure 3, into intersection during amber light
Vehicle, next phase green light open it is bright before, with not less than threshold value Fr probability traveling be not less than de,cDistance.
Claims (10)
1. road grade crossing Two-phases signal controls complete red time calculation method, which is characterized in that specifically include following step
It is rapid:
Step 1, it was divided into N number of period by one day, wherein N takes positive integer；
Step 2, if there are E entrance driveway, road traffic tune of the difference harpoon to each period n, each entrance driveway e in intersection
It looks into, wherein 1≤n≤N, 1≤e≤E obtain the highway traffic data of each period, each entrance driveway；
Step 3, the highway traffic data that analytical procedure 2 obtains, and type of vehicle is divided into C class；
Step 4, for every kind of type of vehicle c, wherein 1≤c≤C calculates the average length of wagon vh of every kind of type of vehicle ccWith
Traffic impact coefficient impc；
Step 5, each entrance driveway e, every kind of type of vehicle c, the vehicle of calculating type c must be passed through in complete red time
Shortest distance de,c；
Step 6, it for each period n, each entrance driveway e, every kind of type of vehicle c, calculates each car i and passes through the shortest distance
de,cRequired time t (i, c, e, n)；
Step 7, for each period n, each entrance driveway e, according to traffic impact coefficient impcIt calculates vehicle and passes through the shortest distance
The frequency distribution of required time t；
Step 8, the threshold value Fr of complete red time cumulative frequency is determined；
Step 9, the complete red time Rr of each period n, each phase ph are calculatedn,ph, 1≤n≤N, ph=1,2.
2. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 1, according to the traffic characteristic of the road grade crossing, one day time was divided into N number of period,
For example: morning peak period, evening peak period, flat peak time section, low ebb period.
3. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
Be, in step 2, key road traffic data includes following aspect: vehicle sequence in the queue, vehicle vehicle body length
Degree, travel speed of the vehicle near stop line.
4. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 3, analyzes length of wagon index, and carry out clustering accordingly, the vehicle of investigation is divided into C class.
5. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 4, for every kind of type of vehicle c, 1≤c≤C, calculates its average length of wagonWherein, NcIt is the vehicle number for belonging to type c, vhcIt (i) is i-th vehicle for belonging to type c
Length of wagon, 1≤i≤Nc。
6. road grade crossing Two-phases signal according to claim 5 controls complete red time calculation method, feature
It is, in step 4, for every kind of type of vehicle c, 1≤c≤C, according to its length of wagon vh that is averagedcCalculate its traffic impact
CoefficientWherein, vhmin=min (vh1,vh2,…,vhC), Round () represents bracket function.
7. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
Be, in steps of 5, for each entrance driveway e, every kind of type of vehicle c, calculate its must pass through in complete red time it is most short
DistanceWherein, vhcIt is the average length of wagon of c type of vehicle, w1It is entrance driveway e
Motor vehicle parking line and nearest the distance between road intersection driveway edge line, w2It is two outside driveways of road intersection
The distance between edge line, impcIt is the traffic impact coefficient of c type of vehicle, impmax=max (imp1,imp2,…,impC)。
8. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 6, for each period n, each entrance driveway e, every kind of type of vehicle c, calculating each car i passes through most short
Distance de,cRequired timeWherein, v (i, c, e, n) is period n, entrance driveway e, type of vehicle c
Speed of i-th vehicle near stop line.
9. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 7, for each period n, each entrance driveway e, according to traffic impact coefficient impcVehicle is calculated by most
The frequency distribution of t the time required to short distance, specifically:
Step 7.1, each car passes through shortest distance de,cRequired time t (i, c, e, n) arrives big sequence from childhood, and merger is several
Group；
Step 7.2, every data of revised data, type of vehicle c presses impcMultiple counted again；
Step 7.3, calculating group away from and class mean；
Step 7.4, each class frequency is counted；
Step 7.5, cumulative frequencies are calculated；
Step 7.6, frequency and cumulative frequency are calculated；
Step 7.7, it is organized into frequency distribution table；
Step 7.8, histogram frequency distribution diagram is drawn；
Step 7.9, cumulative frequency distribution curve is drawn.
10. road grade crossing Two-phases signal according to claim 1 controls complete red time calculation method, feature
It is, in step 9, calculates the complete red time Rr of each period n, each phase phn,ph, 1≤n≤N, ph=1,2, specifically
Calculating process are as follows:
Step 9.1, complete red time Rr needed for determining each period n, each entrance driveway en,e, as its vehicle pass through most short distance
Time corresponding to cumulative frequency distribution curve upper threshold value Fr from required time t；
Step 9.2, the complete red time of period n, phase phWherein, EphIndicate that phase ph allows to pass through
Crossing inlet road set.
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| CN112071093A (en) * | 2020-04-22 | 2020-12-11 | 义硕智能股份有限公司 | Control system and method for traffic signal lamp |
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| CN113192331A (en) * | 2021-04-26 | 2021-07-30 | 吉林大学 | Intelligent early warning system and early warning method for riding safety in internet environment |
| CN114023067A (en) * | 2021-11-08 | 2022-02-08 | 河海大学 | Road travel time prediction method for internet of vehicles environment robustness guidance |
| CN114023067B (en) * | 2021-11-08 | 2022-09-16 | 河海大学 | Road travel time prediction method for internet of vehicles environment robustness guidance |
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