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Method for determining shielding probability of expressway portal type traffic sign large vehicle

A technology of traffic signs and highways, which is applied to the traffic control system of road vehicles, traffic control system, traffic flow detection and other directions, can solve the problems of inaccurate calculation of the probability of occlusion by large vehicles, and improve the visibility and accurate description of signs. , The effect of improving driving safety

Inactive Publication Date: 2019-03-19
NORTHEAST FORESTRY UNIVERSITY
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of inaccurate calculation of the occlusion probability of large-scale vehicles of expressway gantry-type traffic signs in the prior art, the present invention provides a method for determining the occlusion probability of large-scale vehicles of expressway gantry-type traffic signs

Method used

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  • Method for determining shielding probability of expressway portal type traffic sign large vehicle
  • Method for determining shielding probability of expressway portal type traffic sign large vehicle
  • Method for determining shielding probability of expressway portal type traffic sign large vehicle

Examples

Experimental program
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specific Embodiment approach 1

[0034] Specific implementation mode one: a method for determining the occlusion probability of a large-scale vehicle of a highway gantry-type traffic sign provided in this implementation mode specifically includes the following steps:

[0035] A. Calculate the effective viewing distance of large vehicles based on the mechanism of the driver's visual recognition process;

[0036] B. Combining parameters such as traffic volume, traffic composition, vehicle speed, sign size, and visual recognition distance, establish a VISSIM for expressway gantry traffic signs blocked by large vehicles (VISSIM is a microcosmic simulation based on time intervals and driving behaviors. Modeling tools for traffic modeling of urban traffic and public transport operation) simulation models;

[0037] C. Carry out simulation according to different traffic volumes and large vehicle ratio scenarios, and output target data such as occlusion time and occlusion probability.

specific Embodiment approach 2

[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the calculation of the effective visual-reading distance described in step A is:

[0039] The driver's traffic sign recognition process see figure 1 . Among them, the driver's visual characteristics mainly include the sight height and effective visual distance of the small car driver.

[0040] L AD = L AE -L DE

[0041] Among them, the distance L between the two points A and D AD is the driver’s effective viewing distance, and the distance L between points A and E AE is the visual distance, the distance L between the two points D and E DE is the vanishing distance.

[0042] Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0043] Specific Embodiment 3: The difference between this embodiment and Specific Embodiment 2 is that the vanishing distance L DE The calculation process of is:

[0044] L DE =H / tanα

[0045] Among them, the driver's effective viewing angle α can be known from ergonomics, and H represents the vertical height between the mast-type traffic sign and the driver's eyes.

[0046] Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for determining the shielding probability of an expressway portal type traffic sign large vehicle, and belongs to the technical field of urban road traffic control. Themethod comprises the steps that firstly, the effective visual reading distance of shielding of the large vehicle is calculated on the basis of a driver visual recognition process mechanism; then according to the traffic volume, the traffic composition, the vehicle speed, the sign size and the visual recognition distance, a VISSIM simulation model of shielding of the expressway portal type trafficsign large vehicle is established; finally, simulation is carried out according to different traffic volumes and large vehicle proportion scenes, and the shielding time and the shielding probabilityare output. According to the method, the problem that an existing technology is not accurate in calculation of the shielding probability of the expressway portal type traffic sign large vehicle is solved. The method can be used for setting traffic signs.

Description

technical field [0001] The invention relates to a method for determining the occlusion probability of a large vehicle with a gantry-type traffic sign, and belongs to the technical field of urban road traffic control. Background technique [0002] For highways that do not divide lane functions according to vehicle types, when a small car in the same lane is trailing behind a large vehicle in front, the driver of the small car may be blocked by a large vehicle ahead when reading the mast-type signs. The phenomenon of gantry-type signs being blocked by large vehicles may even lead to traffic accidents. The large vehicle referred to in the present invention refers to a truck with a total mass of more than 4500KG (inclusive) or a passenger number (except the driver) of more than 20 people (inclusive) using a large-scale vehicle license plate (black letter and black frame line on a yellow background) And passenger cars, semi-trailer tractors, etc. with a body length of 6 meters o...

Claims

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Application Information

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IPC IPC(8): G08G1/01G06F17/50
CPCG06F30/367G08G1/0104G08G1/0125
Inventor 孙祥龙董君曼齐鸣越陈同
Owner NORTHEAST FORESTRY UNIVERSITY
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