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Elevated road traffic detector laying technology and traffic volume estimation method using the same

A technology of elevated roads and detectors, applied in the direction of traffic flow detection, etc., can solve the problems of traffic volume measurement and calculation, and achieve the effect of fast online estimation

Active Publication Date: 2016-01-13
ANHUI SUN CREATE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid online statistics of traffic volume can still be achieved in the detection area of ​​each traffic detector, but the traffic volume measurement and calculation in the above-mentioned detection blind area has become a difficult problem

Method used

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  • Elevated road traffic detector laying technology and traffic volume estimation method using the same

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Experimental program
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Effect test

Embodiment 1

[0047] In the present embodiment, the traffic detector layout spacing of the elevated road main line section is 800m, so figure 1 The distance between the middle detection section n and the upstream microwave radar detector is 800m. The X-axis distance b between the upstream microwave radar detector and the starting point of the weaving area (that is, the entrance of the ramp) is set to 200m. According to the historical detection data in a period of time, the average speed V of the vehicle at the upstream microwave radar detector is obtained b =72km / h, the average vehicle speed V at the entrance of the ramp a = 38km / h. By a=b·(V b -V a ) / V b It can be determined that the distance between the upstream microwave radar detector and the bayonet on the X axis is a=94m. By t=L / V b It can be determined that the time t required for the vehicle to travel from the upstream microwave radar detector to the detection section n is 40s.

[0048] T 0 Vehicles that pass by the upstrea...

Embodiment 2

[0050] In this embodiment, the arrangement of traffic detectors in Embodiment 1 is adopted, and traffic volume estimation is performed on detection sections without traffic detectors. figure 1 The distance between the middle detection section n-1 and the upstream microwave radar detector is 500m. By t=L / V b It can be determined that the time t required for the vehicle to travel from the upstream microwave radar detector to the detection section n-1 is 25s.

[0051] T 0 Vehicles that pass by the upstream microwave radar detector and vehicles that pass through the bayonet at all times will be at T n-1 Moment (T n-1 =T 0 +25s) reach the detection section n-1 at the same time. The statistical period of the traffic detector is 5 minutes. T 0 At this moment, the number of vehicles detected by the upstream microwave radar detector in a statistical period is 343, and the number of vehicles detected by the bayonet in a statistical period is 98. Therefore, T n-1 The estimated t...

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Abstract

The invention, which belongs to the elevated road traffic field, particularly relates to an elevated road traffic detector laying technology and a traffic volume estimation method using the same. The method comprises the following steps that: road sections of an elevated road are classified and traffic detectors are arranged; relative positions of traffic detectors that are arranged at an entrance ramp road section and a closest elevated main road section are set reasonably and the following formula is met: a=b.(Vb-Va) / Vb. After an interval is determined, needed time t from a traffic detector at an elevated main road section closest to a ramp entrance to a detection section n by a vehicle is obtained; time Tn driving to the detection section n by the vehicle is obtained; and then a traffic volume at the detection section n at the time Tn is obtained. According to the invention, relative positions of the specific traffic detectors are set reasonably at the current frame of the exiting elevated road traffic detection laying technology, thereby meeting a rapid traffic volume estimation requirement of a non-traffic-detector road section at an elevated road. The on-line rapid estimation effect is extremely high; and the detection precision also can be guaranteed effectively.

Description

technical field [0001] The invention belongs to the field of elevated road traffic, and in particular relates to an elevated road traffic detector layout technology and a traffic volume estimation method thereof. Background technique [0002] Traffic volume refers to the number of participants who actually participate in traffic through a certain point on the road or a certain detection section within a unit of time. Traffic volume is the measurement index of the actual traffic capacity of the road section, and it is also the main basis for road classification and determination of road grades. Traffic volume has the characteristics of time and space distribution, so it is a random number, that is, its data changes with time and space. At present, the online calculation of traffic volume, especially the traffic volume of elevated roads, is done by setting up traffic detectors to achieve the purpose of online statistics of the traffic volume. On the one hand, the denser the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/01
Inventor 杨灿林家骐董婉丽邹娇孙晓静
Owner ANHUI SUN CREATE ELECTRONICS