|Table of Contents|

Continuous diversion spacing of ramps based on sigmoid lane-change model(PDF)

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

Issue:
2023年6期
Page:
37-48
Research Field:
道路工程
Publishing date:

Info

Title:
Continuous diversion spacing of ramps based on sigmoid lane-change model
Author(s):
PAN Bing-hong1;  ZHANG Ze-long1;  ZHOU Qian2;  MA Chao-hui3;  WANG Chao1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Hunan Provincial Communications Planning, Survey & Design Institute Co. Ltd., Changsha 410219, Hunan, China; 3. Poly Changda Egineering Co. Ltd., Guangzhou 511400, Guangdong, China)
Keywords:
road engineering;  minimum spacing;  lane-change behavior;  ramp continuous diversion;  trajectory model
PACS:
U412.35
DOI:
10.19721/j.cnki.1671-8879.2023.06.004
Abstract:
To solve the problem that the existing ramp continuous diversion spacing regulations do not take into account the design speed of the ramp and the urgency of vehicle lane change, resulting in insufficient spacing between adjacent exits when the design speed of the ramp is high, causing emergency vehicle lane change, continuous diversion spacing of ramp was studied. First, based on the vehicle operation characteristics and considering the safety of lane change, the operation process of drivers in the continuous diversion area of the ramp was divided into four stages, deceleration, sign recognition, waiting and lane-change stage. Second, based on the measured vehicle trajectories, a sigmoid lane change trajectory model considering the urgency of lane change was proposed, and the applicability of the model to the continuous diversion area of the ramp was proved by the fit test. Finally, the values of the parameters in the spacing model were analyzed, and the recommended minimum spacing values for continuous ramp diversion were proposed. The results show that the sigmoid lane change model has a good fit accuracy of 97.83% and 96.63% for the left lane change and right lane change of vehicles in the ramp, respectively, which can accurately describe the lane change behavior in the continuous diversion area of the ramp. The proposed spacing calculation model is consistent with the vehicle driving characteristics and fits well with the trajectory. When the ramp design speed is less than 60 km/h and more than 60 km/h, the minimum spacing of continuous ramp diversion is controlled by the mainline design speed and the ramp design speed, and the spacing required for the ramp with higher design speed is significantly longer. When the design speed of the ramp is less than 60 km/h, the recommended spacing is similar to the specified value of 《Specifications for Highway Geometric Design》(JTG D20—2017)and 《Guidelines for design of highway grade-separated intersections》(JTG/T D21—2014). When the design speed of the ramp is greater than 60 km/h, the specified value is small. The recommended value of minimum spacing proposed can provide reference for designers to design this index flexibly.9 tabs, 9 figs, 29 refs.

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Last Update: 2023-10-30