|Table of Contents|

Aerial photography data-based method for evaluating traffic safety of highway exit loop ramps(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年04期
Page:
108-118
Research Field:
交通工程
Publishing date:
2024-07-10

Info

Title:
Aerial photography data-based method for evaluating traffic safety of highway exit loop ramps
Author(s):
ZHANG Min1;  CHEN Jia-le1;  ZHANG Chi2;  WANG Shi-fa3;  XIAO Feng4; 5
(1. School of Transportation Engineering, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Chengdu Branch of Sichuan Chengmian Cangba Expressway Co. Ltd., Chengdu 610213, Sichuan, China; 4. Sichuan Yakang Expressway Co. Ltd., Ya'an 625000, Sichuan, China; 5. Sichuan Tibetan Area Expressway Co. Ltd., Chengdu 610047, Sichuan, China)
Keywords:
traffic engineering;  exit loop ramp;  safety evaluation;  travel characteristic;  traffic data acquisition
PACS:
U492.8
DOI:
10.19721/j.cnki.1671-8879.2024.04.010
Abstract:
In order to accurately assess the collision guardrail and tailgating risk under different traffic conditions on highway loop ramps, and to improve the current situation of insufficient traffic safety on exit loop ramps, a driving risk assessment method based on aerial data was proposed. Firstly, by analyzing the speed and trajectory data of three actual cases, the vehicle travel characteristics of highway interchange exit loop ramps were summarized and two main accident types were defined, vehicle collision with the left guardrail after entering the ramp and tailgating due to the following driving. Then, the calculation methods of safety assessment indexes lateral distance and time to collision were introduced, and the traveling safety assessment method was established by selecting appropriate assessment thresholds according to the characteristics of the exit loop ramp. Finally, the effectiveness of this method was verified through the analysis of a real case. The results show that the speed and trajectory control of the vehicle in the on-ramp show consistency, and the vehicle needs about 135 m to go from speed change to stabilization. In order to avoid collision with the left guardrail, the vehicle tends to shift to the right in the on-ramp, and the length of the shift is correlated with the initial speed. In the decelerating lane, there is almost no risk that the vehicle will hit the guardrail, but in the following condition, the front vehicle enters into the on-ramp which may lead to tailgate accidents. Excessive vehicle speed may lead to collision with the left guardrail at the ramp entrance. The proposed method is consistent with the prediction results from historical accident data. This study provides a new method for analyzing the driving safety of exit loop ramps, which quantifies the driving characteristics and safety analysis, and can provides theoretical support for the management and design of interchange exits.4 tabs, 11 figs, 37 refs.

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Last Update: 2024-07-10