Developing a New Surrogate Safety Indicator Based on Motion Equations

Mina Sayadi,Hooman Alenoori,Navid Nadimi,Hamid Behbahani

doi:10.7307/ptt.v26i5.1388

Abstract

Collision avoidance system (CAS), with the help of surrogate safety measures is a beneficial tool for reducing driver errors and preventing rear-end collisions. One of the most well-known surrogate safety measures to detect rear-end conflicts is Time-to-collision (TTC). TTC refers to the time remaining before the rear-end accident if the course and the speed of vehicles are maintained constant. Different surrogate measures have been derived from TTC; however, the most important are Time Exposed Time-to-collision (TET) and Time Integrated Time-to-collision (TIT). In this paper a new surrogate safety measure based on TTC notion has been developed. This new indicator merges TET and TIT into one measure and gives a score between 0 and 100%, as the probability of collision. Applying this indicator in CAS as a safety measure will be more useful than TET&TIT, to reduce driver errors and rear-end collisions.

Highlights

Automated in-vehicle systems are being developed by car manufacturers with the aim of reducing driver’s workload and errors
N = ni, i=1 where: ni is the number of observations in the “carfollowing situation” i
This paper aims to develop a new surrogate safety measure for rear-end collisions

Summary

Introduction

Automated in-vehicle systems are being developed by car manufacturers with the aim of reducing driver’s workload and errors. A group of such systems is called advanced driver assistance systems (ADAS), and consists of systems such as intelligent speed adaptation (ISA), adaptive cruise control (ACC), collision avoidance system (CAS), etc. Among these systems, CAS is designed to alert the drivers on time if there is a possibility of a rear-end collision, to avoid such accidents [1,2,3,4]. In developing CAS, first it is essential to define a warning strategy that warns the drivers when there is a rear-end collision risk and there is enough time to receive the driver reactions [2,3,4,5,6]

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