|Table of Contents|

Operating speed model of tunnel exit and interchange exit in short distance sections based on aerial photography data(PDF)

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

Issue:
2024年2期
Page:
136-150
Research Field:
交通工程
Publishing date:

Info

Title:
Operating speed model of tunnel exit and interchange exit in short distance sections based on aerial photography data
Author(s):
ZHANG Chi1;  GAO Yan-yang1;  YANG Rong-wei2;  LIU Chang-he1;  XIE Zi-long1;  JIN Yin-li3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Shaanxi Provincial Transport Planning Design and Research Institute, Xi'an 710065, Shaanxi, China; 3. School of Electronics and Control Engineering, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  operating speed model;  YOLO-v5 algorithm;  short distance section;  aerial photography data
PACS:
U411
DOI:
10.19721/j.cnki.1671-8879.2024.02.013
Abstract:
To explore the pattern of vehicle speed variation in short distance sections between tunnel exits andinterchange exits, and to alleviate the current insufficiency in driving safety on short-distance sections ofmountainous highways. Vehicle speed models in such sections was studied. Firstly, based onaerial drone footage, real-time vehicle speed and trajectory data were extracted from sections with short clearancebetween tunnel exits and interchange exits on the Xi-Han(Xi'an to Hanzhong)Expressway and three other locations, and a programwritten with the YOLO-v5 algorithm was used. This was complemented with control group data from a driving simulationsystem. Secondly, the vehicle operation and sectional speed distribution in this areafor macroscopic analysis were analyzed statistically, the independent variables for constructing the speed model was determined. Finally,non-linear curve fitting software 1stOpt was applied to regress the analyzed data, establishing predictive models forthe operational speeds of small and large vehicles driving on or exiting the mainline in short-distance exitsections. These models were validated in a real-world short-distance section project in a Southwestern Mountainous Area. The results show that there is a significant positive correlation between vehicle speed in short-distanceexit sections and mainline radius, the vehicle's distance from the tunnel entrance, and the clearance length. Theestablished speed prediction models passed tests for goodness of fit, statistical residual examination, and relativeaverage error, with an average relative error between predicted and actual values of less than 10%, satisfyingaccuracy requirements. This research can be applied to actual engineering projects in short-distance sectionsbetween tunnel exits and interchange exits, accurately characterizing vehicle speed variations in this area andproviding valuable reference for predicting vehicle operational speeds and representing speed variation patterns.13 tabs, 20 figs, 30 refs.

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Last Update: 2024-03-01