CN105046963A - Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram - Google Patents
Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram Download PDFInfo
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Abstract
The invention belongs to the urban elevated road traffic diversion dredging field and especially relates to an elevated-road-section traffic-jam critical value calculating method based on a basic traffic diagram. The method comprises the following steps of 1) taking an elevated bridge road which connects adjacent exit and entrance ramps as one elevated road section; acquiring traffic flow data and each vehicle running speed data on each elevated road section; 2) calculating a traffic flow and an average speed of vehicles on each road section in each acquisition period; 3) taking a sample set; 4) drawing a scatter diagram of the basic traffic diagram; 5) calculating and acquiring a road average critical vehicle speed Vm at a maximum traffic flow and an unblocked vehicle speed Vf of the elevated road section. The method fits a current elevated-road actual dynamic change road condition of a current city. High accuracy of calculating data is ensured. An accurate basis can be provided for a traffic manager to carry out on-line traffic diversion so that unblocked performance of the traffic on the elevated road is finally guaranteed.
Description
Technical field
The invention belongs to Urban Overhead Road Traffic shunting dredging field, be specifically related to a kind of overpass road section traffic volume based on traffic parent map and block up critical value computing method.
Background technology
Traffic congestion is that the population distribution that causes of economic development imbalance is uneven, urban transportation supply is limited and city layout and economic development such as not to mate at the concentrated reflection of various social contradications, is a global problem.For the traffic above-ground being in ground, multilevel traffic to overpass there is relatively high closure property especially, once block up, very easily cause long distance, block on a large scale, even Regional Road Network paralysis, passenger and driver also can often face in a hopeless position situation.Although country's " road status information issue specification " (GA/T994-2012) standard determines overpass and passes through that state is corresponding with vehicle running speed to be shown, to be used for contrasting current overpass running data, for traffic administration person provides traffic diverging and induction reference.But, practical problems is: because each urban development degree is different, the difference of area road planning, even also there is road conditions track difference etc. between each overpass of the same area, the Uniform provisions of above-mentioned only idealized and staticize, often there is flexibility ratio not enough and lack adaptive shortcoming, thus perfect specific aim cannot be reached far away to fit the dynamic use needs of each section overpass.How to seek a kind ofly to operate the traffic congestion account form succinctly and reasonably objectified, can while the actual dynamic change road conditions of the laminating current overpass in current city, also its high precision calculating data and high specific aim can be guaranteed, thus accurate foundation can be provided for traffic administration person carries out online traffic diverging, to dispose police strength and perform traffic diverging induction operation before traffic congestion arrived, the having a good transport and communication network property of ultimate guarantee overpass is the technical barrier that those skilled in the art are urgently to be resolved hurrily in recent years.
Summary of the invention
Object of the present invention, for overcoming above-mentioned the deficiencies in the prior art, provides a kind of overpass road section traffic volume based on traffic parent map of more efficient quick to block up critical value computing method.This method can while the actual dynamic change road conditions of the laminating current overpass in current city, also can guarantee that its high precision calculating data and principle of readjustment, restructuring, consolidation and improvement are to sexual demand, thus accurate foundation can be provided for traffic administration person carries out online traffic diverging, and then police strength can be disposed before traffic congestion is arrived and perform traffic diverging induction operation, with the having a good transport and communication network property of ultimate guarantee overpass.
For achieving the above object, present invention employs following technical scheme:
Overpass road section traffic volume based on traffic parent map blocks up critical value computing method, it is characterized in that comprising the following steps:
1), according to ring road position, overpass entry and exit, an overpass section is decided to be with the overpass road connecting adjacent entry and exit ring road; Obtain the device data of the microwave radar detection device in each overpass section, these data at least comprise overpass road section traffic volume flow data and each vehicle travel speed data;
2), determine a collection period, according to this overpass road section traffic volume flow and vehicle speed data, calculate the magnitude of traffic flow in each collection period of every bar section and vehicle average velocity;
3), get the magnitude of traffic flow within one day corresponding to all collection period and vehicle average velocity as sample set, be designated as:
Q＝{(x,y)|x＝x
1,x
2......x
n；y＝y
1,y
2......y
n}，
Wherein,
X represents overpass road section traffic volume flow;
Y represents overpass section vehicle average speed, unit km/h;
4), according to the magnitude of traffic flow in sample set and vehicle average speed data, the scatter diagram of traffic parent map is drawn;
5), with flow-speed parent map regression equation X=β
0+ β
1(Y)
2+ β
2y+ ε, according to the magnitude of traffic flow in sample set and vehicle average speed data, by its typing regression equation calculation model, obtains regression coefficient β
0, β
1, β
2with statistical error ε;
According to the mathematical meaning of regression curve, namely value corresponding to hump be the maximum magnitude of traffic flow and critical vehicle velocity amplitude, and above-mentioned flow-speed parent map regression equation is converted into following formula:
When getting
when being 0 value, instead push away Y value, obtain the average critical car speed V under maximum traffic flow situation corresponding to hump
m; Respectively state regression coefficient and statistical error ε substitution regression equation by aforementioned, calculate the average critical car speed V in section during the maximum magnitude of traffic flow obtaining this overpass section
mwith unimpeded car speed V
fnumerical value, computing formula is as follows:
Wherein, V
mand V
funit be km/h.
Described step 1) in, the device data of microwave radar detection device also comprises current device numbering data, present position numbering data and current residing traffic route section title ID data.
Described step 2) in, a collection period is one hour; The magnitude of traffic flow is the car sum of all equivalents that in each hour, this traffic route section is passed through, and vehicle average speed is the mean value of all Vehicle Speed in collection period.
Major advantage of the present invention is:
1) many defects such as the dynamic headroom demand of the low and current overpass of can not intuitively fitting of dirigibility that what the mode, having abandoned traditional simple dependence GB correspondence table caused such as manipulate.The present invention is in the mode of traffic parent map, calculated by regression equation model, rely on the dynamic relationship of the magnitude of traffic flow and average speed, completely present road traffic state dynamic changing curve, intuitively and targetedly accurately reflect the traffic dynamic characteristic of " present road ".This method utilizes microwave radar detection device on overpass section to carry out point-to-point image data, the sample set of traffic parent map scatter diagram is drawn in the acquisition of precision, adopt regression analysis matching flow-speed parent map, and then calculate acquisition critical speed and the unimpeded speed of a motor vehicle.The present invention is by point-to-point data sampling, and achieve realization and the laminatingization management in appointment section, appointed area, its adaptability is obviously stronger with management specific aim.By with the dynamic traffic data of above-mentioned overpass, the experience that also effectively improves judges and traditional standard static judges that the deficiency of overpass traffic congestion, its method degree that becomes more meticulous is high, runs and very reliably stablizes.
The present invention relies on above-mentioned point-to-point computation process, final section average circle car speed when obtaining the maximum magnitude of traffic flow in unimpeded car speed and this overpass section.After the above-mentioned speed of acquisition, once the average overall travel speed in this overpass section is lower than above-mentioned average critical car speed, then traffic administration person can carry out traffic evacuation shunting and induction operation; And judge what moment to arrange police strength in, intervene overpass traffic administration further to rationalize.Otherwise once the average overall travel speed in this overpass section is higher than unimpeded car speed, also just current this section of overpass section vehicle condition of meaning is fabulous.Traffic administration person can consider when traffic diverging, and suggestion driver's prioritizing selection this section of overpass sections of road, to promote overhead path resource utilization factor.By aforesaid operations head end, be finally vehicle supervision department's more careful grasp overpass traffic behavior, the traffic congestion that gives warning in advance provides decision support technique.
Accompanying drawing explanation
Fig. 1 is workflow schematic diagram of the present invention;
Fig. 2 is the average critical car speed V under flow-rate curve
mwith unimpeded car speed V
flocation diagram;
Fig. 3 is in embodiment 1, the 24 hourly traffic volumes-speed of a motor vehicle single-point graph of a relation of sample data;
Fig. 4 is in embodiment 1, the magnitude of traffic flow-speed curve diagram of sample data.
Embodiment
For ease of understanding, in conjunction with Fig. 1-2, following further describing is done to implementation process of the present invention herein:
Overpass road section traffic volume based on traffic parent map blocks up critical value computing method, and the method comprises the following steps:
1), according to ring road position, overpass gateway, overpass is divided into Entrance ramp, exit ramp and overhead section; Need the overpass section obtaining data herein, be also the overpass section of above-mentioned connection adjacent entry and exit ring road.
2), obtain the device data of each overpass section microwave radar detection device, these data at least comprise overpass road section traffic volume flow data and vehicle speed data.
3), according to overpass road section traffic volume flow and vehicle speed data, the magnitude of traffic flow in the collection period of one, every bar section and vehicle average velocity is calculated; Get the magnitude of traffic flow within one day corresponding to all collection period and vehicle average velocity as sample set, be designated as Q={ (x, y) | x=x
1, x
2... x
n; Y=y
1, y
2... y
n, wherein x represents overpass road section traffic volume flow, and y represents overpass section vehicle average speed.
4), according to the magnitude of traffic flow in sample set and vehicle average speed data, the scatter diagram of traffic parent map is drawn; Adopt regression equation matching traffic parent map flow-rate curve, determine regression coefficient, section average circle car speed V when calculating the maximum magnitude of traffic flow in this overpass section
m, and unimpeded car speed V
f.Wherein, regression coefficient and curve fitting process, adopt the regression equation model in Conventional mathematical field to carry out data inputting and the Fitting Calculation, just repeat no more herein.
The device data of the microwave radar detection device in above-mentioned, also comprises device numbering, present position numbering and section name data etc.And the scope of a collection period is generally one hour, the magnitude of traffic flow is all equivalent car sums that in collection period, section is passed through, and vehicle average speed is the mean value of all car speeds in collection period.
Adopt regression equation matching traffic parent map flow-rate curve to refer to, arranging flow-speed parent map regression equation is X=β
0+ β
1(Y)
2+ β
2y+ ε, according to the magnitude of traffic flow in sample set and vehicle average speed data, calculates regression coefficient β
0, β
1, β
2with statistical error ε; Regression coefficient and statistical error are substituted into the regression equation after transforming
As shown in Figure 2, when getting
when being 0 value, instead push away Y value, obtain the average critical car speed V under maximum traffic flow situation corresponding to hump
m; Obtain average critical car speed V
mwith unimpeded car speed V
fvalue, computing formula is as follows:
Wherein, V
msection average vehicle speed when equaling to obtain the maximum magnitude of traffic flow, the also average critical car speed in i.e. this traffic route section, unimpeded car speed V
faccording to traffic parent map and the traffic flow basic theories of routine, be 2 times of V
m, V
mand V
funit be km/h.
Due to above-mentioned computation process, data are drawn materials and even account form all objectively takes from current overpass section, and therefore this method possesses the extremely strong point-to-point specific aim for appointment section and adaptability.During practical operation, traffic administration person, by gathering the information data in each section and corresponding above-mentioned speed data, can carry out traffic administration layout targetedly.In brief, certain section of overpass section is lower than above-mentioned average critical car speed V
m, then certainly exist congestion points, traffic administration person can carry out giving warning in advance of this section and online police strength purge operation; And not only inflexiblely to manage according to the specification of just blocking up lower than 20km/h.And relative, once certain section of overpass section is higher than unimpeded car speed V
f, then the inevitable road conditions in this section are fabulous, and traffic administration person, when the traffic dispersion shunting carrying out other sections, preferentially should advise that driver selects this sections of road, to promote traffic resource utilization factor.
Certainly, on the basis of the above, herein even can according to acquisition data, the further refinement carrying out GB threshold value is distinguished, to promote its adaptability for the overpass section in all kinds of different regions and even section.Specific as follows:
A, definition initial threshold, initial threshold is determined according to country's " road status information issues specification " (GA/T994-2012) standard, as shown in table 1:
Table 1
For overpass that " road status information issue specification " (GA/T994-2012) standard is determined passes through, state is corresponding with vehicle running speed to be shown table 1.
According to table 1, determine that initial threshold is 20km/h and 50km/h.
B, carry out V
m, V
fwith comparing of initial threshold, as:
If V
m<20, then threshold value of blocking up gets V
m, threshold value of comparatively blocking up gets 20km/h;
If V
m>20, then threshold value of blocking up gets 20km/h, and threshold value of comparatively blocking up gets V
m;
If V
f<50, then more unimpeded threshold value gets V
m, unimpeded threshold value gets 50km/h;
If V
f>50, then more unimpeded threshold value gets 50, and unimpeded threshold value gets V
f.
If V
m=20, V
f=50, still divide current state by initial threshold.
According to revised overpass traffic congestion threshold value, overpass road section traffic volume jam level can be determined, carry out further careful management to facilitate traffic administration person.Specifically as shown in table 2:
Table 2
Table 2 is overpass traffic congestion correction threshold and traffic jam level mapping table.
Embodiment 1
1), according to ring road position, overpass gateway, overpass is divided into Entrance ramp, exit ramp and overhead section, chooses one section of overhead section as detected object;
The magnitude of traffic flow that overhead section microwave radar detection device selected by acquisition detects and vehicle speed data are as follows:
(32,71),(24,73),(36,69),…(30,65),…(198，27)；
Measurement period is 5 minutes, and the data obtaining obtaining in a day are totally 288 right.
2), according to overpass road section traffic volume flow and vehicle speed data, the magnitude of traffic flow in one, this section collection period (being also 1h) and vehicle average velocity is calculated:
Also namely:
The 1h magnitude of traffic flow is the magnitude of traffic flow sum of in this hour each 5 minutes;
1h vehicle average velocity is the mean value of all car speeds in this hour.
Such as, the magnitude of traffic flow between sample 0 o'clock to 1 o'clock is:
32+24+36+……+30＝158pcu/h；
Vehicle average velocity between sample 0 o'clock to 1 o'clock is:
(32*71+24*73+ ... + 30*65)/158=65km/h, by that analogy.
3), the magnitude of traffic flow within one day corresponding to all collection period and vehicle average velocity is got as sample set, as follows:
Q＝{(x,y)|x＝158,111,60,35,25,40,......185；y＝65,70,75,81,80,81,......70}
4), according to the magnitude of traffic flow in sample set and vehicle average speed data, the scatter diagram of traffic parent map is drawn, as shown in Figure 3; Wherein the X-axis of Fig. 3 is vehicle average overall travel speed in each collection period in 24h, and Y-axis is each magnitude of traffic flow in each collection period of corresponding X-axis in 24h.
5), as shown in Figure 4, according to the magnitude of traffic flow in sample set and vehicle average speed data, with mathematical regression equation model, regression coefficient β is calculated
0, β
1, β
2with statistical error ε, carry out numerical value substitution, finally obtain following formula:
X＝387.716-0.399(Y)
2+25.743Y+0.0000102
Calculate average critical car speed V
mwith unimpeded car speed V
f, as follows:
5), further, then according to country " road status information issues specification " (GA/T994-2012), can determine that the initial threshold of overpass traffic jam level is 20km/h and 50km/h.
6), V is compared
m, V
fwith initial threshold, correction threshold is 20km/h, 32.26km/h, 50km/h, 64.5km/h.
7), according to revised traffic congestion threshold value, estimate that the traffic jam level in overpass sample section is as follows according to table 3:
Table 3 sample section traffic jam level table
| Traffic jam level | Very unimpeded | Unimpeded | Jogging | Crowded | Block up |
| Traffic congestion threshold value | ≥64.5 | 50≤v<64.5 | 32.26≤v<50 | 20≤v<32.26 | <20 |
According to table 3, the traffic jam level that known sample section each sampling period is corresponding, traffic control department, according to regulatory requirement, can take corresponding traffic measure according to each grade difference.
Claims (3)
1. to block up critical value computing method based on the overpass road section traffic volume of traffic parent map, it is characterized in that comprising the following steps:
1), according to ring road position, overpass entry and exit, an overpass section is decided to be with the overpass road connecting adjacent entry and exit ring road; Obtain the device data of the microwave radar detection device in each overpass section, these data at least comprise overpass road section traffic volume flow data and each vehicle travel speed data;
2), determine a collection period, according to this overpass road section traffic volume flow and vehicle speed data, calculate the magnitude of traffic flow in each collection period of every bar section and vehicle average velocity;
3), get the magnitude of traffic flow within one day corresponding to all collection period and vehicle average velocity as sample set, be designated as:
Q＝{(x,y)|x＝x
1,x
2......x
n；y＝y
1,y
2......y
n}，
Wherein,
X represents overpass road section traffic volume flow;
Y represents overpass section vehicle average speed, unit km/h;
4), according to the magnitude of traffic flow in sample set and vehicle average speed data, the scatter diagram of traffic parent map is drawn;
5), with flow-speed parent map regression equation X=β
0+ β
1(Y)
2+ β
2y+ ε, according to the magnitude of traffic flow in sample set and vehicle average speed data, by its typing regression equation calculation model, obtains regression coefficient β
0, β
1, β
2with statistical error ε;
According to the mathematical meaning of regression curve, namely value corresponding to hump be the maximum magnitude of traffic flow and critical vehicle velocity amplitude, and above-mentioned flow-speed parent map regression equation is converted into following formula:
When getting
when being 0 value, instead push away Y value, obtain the average critical car speed V under maximum traffic flow situation corresponding to hump
m; Respectively state regression coefficient and statistical error ε substitution regression equation by aforementioned, calculate the average critical car speed V in section during the maximum magnitude of traffic flow obtaining this overpass section
mwith unimpeded car speed V
fnumerical value, computing formula is as follows:
Wherein, V
mand V
funit be km/h.
2. a kind of overpass road section traffic volume based on traffic parent map according to claim 1 blocks up critical value computing method, it is characterized in that: described step 1) in, the device data of microwave radar detection device also comprises current device numbering data, present position numbering data and current residing traffic route section title ID data.
3. a kind of overpass road section traffic volume based on traffic parent map according to claim 1 blocks up critical value computing method, it is characterized in that: described step 2) in, a collection period is one hour; The magnitude of traffic flow is the car sum of all equivalents that in each hour, this traffic route section is passed through, and vehicle average speed is the mean value of all Vehicle Speed in collection period.
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