CN1870066A - Evaluation system for road level-cross - Google Patents

Abstract

A planar cross evaluation system of road consists of single cross evaluation unit, line and road network evaluation unit. It is featured as utilizing coherence calculation model and confirmation of key cross to carryout evaluation by line and road network evaluation unit, adding evaluation index of two-time parking rate at cross on said unit and applying ratio of two-time parking vehicle number in one cycle to bearing off vehicle number at green lamp time in said cycle as two-time parking rate.

Description

Evaluation system for road level-cross

Technical field

The present invention relates to traffic and transport field, relate in particular to a kind of device and method evaluation system of measurement, collection, record and storage of Traffic Information, particularly a kind of evaluation system for road level-cross.

Background technology

In the prior art, the traffic quality evaluation of level-crossing realizes by manual research, at first utilizes the artificial traffic data that obtains, and utilizes these data that the traffic of crossing is made evaluation then.The full detail of the road grade crossing data of gathering in can not the All Time of complete covering crossing, and have the part of duplication, cause the waste of a large amount of manpower and materials; In addition, manual research adopts traditional figure, table card, volume or simple relational database, and inefficiency is often made mistakes, and Data Update is untimely, can not adapt to the requirement of modern management.

Summary of the invention

The purpose of this invention is to provide a kind of evaluation system for road level-cross, described this evaluation system for road level-cross will solve that the data that exist in the manual research level-crossing traffic quality process in the prior art are imperfect, the technical matters of manpower and materials waste and inefficiency.

This evaluation system for road level-cross of the present invention is by magnitude of traffic flow sensor, traffic signal light condition sensor and server constitute, wherein, described magnitude of traffic flow sensor links to each other with described server by data transmission link respectively with the traffic signal light condition sensor, described traffic signal light condition sensor is arranged on road grade crossing, described magnitude of traffic flow sensor is arranged on the road of road grade crossing and adjacency, described server receives from the data-signal of magnitude of traffic flow sensor and traffic signal light condition sensor and stores in the database, described server is estimated the traffic quality of this single crossing according to the data-signal of single crossing, select the data-signal of the crucial crossing of two above numbers in the data-signal of a plurality of single crossings of described server in setting regions, and calculate secondary parking rate between the adjacent crucial crossing, and road net in the setting regions is carried out coherence's evaluation calculation according to data-signal.

Further, described server is connected with at least one print-out device.

Further, described secondary parking rate is the number of vehicles and the ratio that sails out of number of vehicles in the green time of these traffic lights in transformation period that the secondary in the traffic lights transformation period stops, the number of vehicles that described secondary stops be go on the access road of level-crossing, double or chance red light and the number of vehicles of stopping twice or more.

Further, the computation model of described twice parking rate is,

$\left\{\begin{array}{c}S=0.15+7.5y-7.2u\\ 0.9\≤\frac{y}{u}\≤1.1\end{array}\right.$

Wherein, S represents the secondary parking rate, and y represents the ratio of track flow and track saturation volume, u

The ratio of expression effective green time and traffic lights transformation periods.

Further, in described coherence's evaluation calculation, utilize server calculate in two adjacent crossings, because the blocking up of crossing, downstream, and green light lost time that causes the crossing, upstream to take place.

Further, described to setting regions in road net carry out in coherence's evaluation calculation process, adopt following coherence calculation Model Calculation to obtain green light lost time,

Wherein, Tij represents green light lost time, the vehicle queue length of 1 expression red light finish time, and L represents the spacing of adjacent single crossing, and V represents flow, and C represents the traffic capacity,

Adopt following computation model to calculate the evaluation green light coefficient of coherence of lost time,

Wherein, R _IjThe expression coefficient of coherence, the green time of expression crossing, upstream loss and the ratio of green light duration,

Tij=Rij*T, wherein T represents the green time of crossing, upstream.

Principle of the present invention is: the research that the present invention is detailed interference phenomenon mutually between the crossing, and with this as the basis, circuit and road network are estimated.

Wherein, coherence's definition: adjacent crossing is because the blocking up of crossing, downstream (being designated as j), and causes the green light of crossing, upstream (being designated as i) that loss is arranged, and we just are called the crossing, downstream the crossing, upstream is had the coherence, are designated as R _Ij, the green time of loss is designated as T _Ij

Showing owing to the relevant of crossing, downstream causes the green light of crossing, upstream that loss is arranged of the influence of coherency issues will directly influence the traffic efficiency of upstream intersection aspis vehicle like this, and this influence is particularly outstanding performance peak period.By simulation study, obtain the coherence calculation model:

Wherein, 1 is the red light queue length of the finish time, and L is the crossing spacing, and V is a flow, and C is the traffic capacity, and I have adopted coefficient of coherence to estimate green light lost time in evaluation system the inside, and formula is as follows:

R _IjBe coefficient of coherence, the green time that loses on certain direction of expression crossing, upstream and the ratio of this direction green light duration, Tij=Rij*T wherein T is the green time of crossing, upstream.

The present invention and prior art contrast, and its effect is actively with tangible.The present invention can utilize in good time detected crossing data on flows that the traffic of crossing is made evaluation, can to peak time the crossing saturated or make evaluation near the traffic under the state of saturation, the traffic of the line network that also can satisfy the need is made evaluation.

Purpose of the present invention, feature and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

Description of drawings

Fig. 1 is the high-level schematic functional block diagram of a preferred embodiment of evaluation system for road level-cross of the present invention.

Embodiment

As shown in Figure 1, a kind of evaluation system for road level-cross of the present invention, by magnitude of traffic flow sensor, traffic signal light condition sensor and server constitute, wherein, described magnitude of traffic flow sensor links to each other with described server by data transmission link respectively with the traffic signal light condition sensor, described traffic signal light condition sensor is arranged on road grade crossing, described magnitude of traffic flow sensor is arranged on the road of road grade crossing and adjacency, described server receives from the data-signal of magnitude of traffic flow sensor and traffic signal light condition sensor and stores in the database, described server is estimated the traffic quality of this single crossing according to the data-signal of single crossing, select the data-signal of the crucial crossing of two above numbers in the data-signal of a plurality of single crossings of described server in setting regions, and calculate secondary parking rate between the adjacent crucial crossing, and road net in the setting regions is carried out coherence's evaluation calculation according to data-signal.

Further, described server is connected with at least one print-out device.

The present invention can be divided into spatial data library module 1, attribute data library module 2, database management module 3 and decision analysis module 4 in force, described spatial data library module 1 can be divided into crossing figure layer 10, highway section ring road figure layer 11 and 12 3 parts of Background From Layer, concrete, the spatial entities that comprises in the described spatial data library module 1 comprises a class entity and line class entity: line class entity is according to different highway section, the ring roads of being divided into of traffic characteristics; Point class entity then will be divided into route origin and destination, ring road joining and level-crossing.When drawing electronic chart,, both need be offset slightly and draw for avoiding the overhead and overhead overlapping demonstration of surface road down.The segmentation of overpass relies on ring road to carry out, and its traffic characteristics show as and import and shunting, have any different with common highway section, therefore introduce ring road in the online class entity, distinguish the ring road joining in a class entity.The circuit terminal does not possess the friendship attribute of the some class entity of the present invention's research, is therefore distinguished.In addition this module also must comprise map edit, modification, storage, output, with function such as feature data association.Attribute data library module 2 can be divided into two classes: entity attribute table 20 and survey data table 21.Entity attribute table can be divided into road section information table 200, ring road information table 201, crossing integrated information table 202 and lane information table 203; Survey data table 21 is divided into traffic investigation table 210, speed of a motor vehicle questionnaire 211 and intersection parking questionnaire 212 according to the difference of investigation content.The major function of attribute data management is the input, editor, processing, text output of data and related with spatial data.Total following 10 indexs in the described decision analysis module are respectively facility maintenance 40, traffic sign and marked management 41, environmental evaluation index 42, saturation degree 43, conflict point density 44, efficient 45, delay 46, secondary parking rate 47, road accident rate 48, coherence 49.

Claims (6)

1, a kind of evaluation system for road level-cross, by magnitude of traffic flow sensor, traffic signal light condition sensor and server constitute, it is characterized in that: described magnitude of traffic flow sensor links to each other with described server by data transmission link respectively with the traffic signal light condition sensor, described traffic signal light condition sensor is arranged on road grade crossing, described magnitude of traffic flow sensor is arranged on the road of road grade crossing and adjacency, described server receives from the data-signal of magnitude of traffic flow sensor and traffic signal light condition sensor and stores in the database, described server is estimated the traffic quality of this single crossing according to the data-signal of single crossing, select the data-signal of the crucial crossing of two above numbers in the data-signal of a plurality of single crossings of described server in setting regions, and calculate secondary parking rate between the adjacent crucial crossing, and road net in the setting regions is carried out coherence's evaluation calculation according to data-signal.

2, evaluation system for road level-cross as claimed in claim 1 is characterized in that: described server is connected with at least one print-out device.

3, evaluation system for road level-cross as claimed in claim 1, it is characterized in that: described secondary parking rate is the number of vehicles and the ratio that sails out of number of vehicles in the green time of these traffic lights in transformation period that the secondary in the traffic lights transformation period stops, the number of vehicles that described secondary stops be go on the access road of level-crossing, double or chance red light and the number of vehicles of stopping twice or more.

4, evaluation system for road level-cross as claimed in claim 3 is characterized in that: the computation model of described twice parking rate is,

$\left\{\begin{array}{c}S=0.15+7.5y-7.2u\\ 0.9\≤\frac{y}{u}\≤1.1\end{array}\right.$

Wherein, S represents the secondary parking rate, and y represents the ratio of track flow and track saturation volume, and u represents the ratio of effective green time and traffic lights transformation periods.

5, evaluation system for road level-cross as claimed in claim 1, it is characterized in that: in described coherence's evaluation calculation, utilize server calculate in two adjacent crossings, because the blocking up of crossing, downstream, and green light lost time that causes the crossing, upstream to take place.

6, evaluation system for road level-cross as claimed in claim 1 is characterized in that: described to setting regions in road net carry out in coherence's evaluation calculation process, adopt following coherence calculation Model Calculation to obtain green light lost time,

Wherein, Tij represents green light lost time, and l represents the red light vehicle queue length of the finish time, and L represents the spacing of adjacent single crossing, and V represents flow, and C represents the traffic capacity,

Adopt following computation model to calculate the evaluation green light coefficient of coherence of lost time,

Wherein, R _IjThe expression coefficient of coherence, the green time of expression crossing, upstream loss and the ratio of green light duration,

Tij=Rij*T, wherein T represents the green time of crossing, upstream.

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