摘要
Car following is the most common driving scenario,and rear-end collisions in car following scenario are the most common accidents.TTC(time to collision)is widely employed as the risk indicator in existing rear-end collision warning systems,however,assessment model using only TTC may ignore some high-risk scenarios.Therefore,the concept of potential risk in car following scenario is proposed,and the driver’s maximum brake response time to avoid collision is defined as TM(time margin),which is the basis of the assessment model in this study.One hundred and thirty-nine(139)dangerous car following cases from China-FOT(Field Operation Test)naturalistic driving study database are extracted in reference from detection criteria on dangerous cases,of which TM at the braking moment of preceding vehicle is calculated,thus dangerous domains of two risk levels are determined by the distribution of TM.A potential risk warning system is also designed based on the assessment model,in order to further reduce rear-end collisions in combination with rear-end collision warning system.
