Assessing performance of collision mitigation brake system in Chinese traffic environment

Advanced driver-assistance systems such as Honda’s collision mitigation brake system(CMBS)can help achieve traffic safety.In this paper,the naturalistic driving study and a series of simulations are combined to better evaluate the performance of the CMBS in the Chinese traffic environment.First,because safety-critical situations can be diverse especially in the Chinese environment,the Chinese traffic-accident characteristics are analyzed according to accident statistics over the past 17 years.Next,10 Chinese traffic-accident scenarios accounting for more than 80%of traffic accidents are selected.For each typical scenario,353 representative cases are collected from the traffic-management department of Beijing.These real-world accident cases are then reconstructed by the traffic-accident-reconstruction software PC-Crash on the basis of accident-scene diagrams.This study also proposes a systematic analytical process for estimating the effectiveness of the technology using the co-simulation platform of PC-Crash and rateEFFECT,in which 176 simulations are analyzed in detail to assess the accident-avoidance performance of the CMBS.The overall collision-avoidance effectiveness reaches 82.4%,showing that the proposed approach is efficient for avoiding collisions,thereby enhancing traffic safety and improving traffic management.

Methods for fusing uncertain results obtained from different models in accident reconstruction

Considering that almost all existing solutions of fusing different reconstructed results require experts’opinions and the issue of how to fuse probabilistic results and mixed results has not been discussed.Two solutions are proposed.The first is based on the Monte Carlo Method(FMCM),while the second is based on the Sub-Interval Technique(FSIT).The method based on FMCM generates sample points according to the distribution of each uncertain result firstly,and then gives out the cumulative distribution function of the final fused result by statistical analysis.The method based on FSIT gets the result fusion interval set according to lower and upper bounds of all interval results and a given length d of each sub-interval firstly,and then calculate the weighted matrix of the result fusion interval.As a result,the cumulative distribution function of the final fused result can also be given out by statistical analysis.Finally,three real accidents are given to demonstrate the methods of FMCM and FSIT,the results of which show that both work well in practice.