Vehicle Accident Pattern Analysis and Rear-end Collision Risk Assessment at Highway Design Stage on Downhill Section of Mountain Highway
Taking the expressway in Yunnan as an example,an analysis and comparison of traffic accident data across the entire expressway and its downhill sections were conducted,focusing on the proportion of vehicle types involved in accidents and accident patterns.The results showed that:in downhill sections,accidents involving large vehicles increased by 64.0%,medium-sized vehicles by 128.9%,while small vehicle accidents decreased by 93.4%,with obvious differences.In the design and management of downhill sections,attention should be paid not only to large vehicles,but also to the driving safety of medium-sized vehicles.Rear-end collisions constituted over half of the accidents in both the entire expressway and downhill sections.A quick verification method using the Monte Carlo method was proposed,considering parameters such as slope gradient,vehicle speed,following distance,and road surface adhesion in rainy conditions.This method offers a rapid and straightforward means to verify downhill section design parameters during the highway design phase and assess the risk of rear-end collisions.
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