Hamid Behbahani
Professor
School of Civil Engineering,
Iran University of Science and Technology
Navid Nadimi
Ph.D. candidate, Department of Civil Engineering
Iran University of Science and Technology
Hooman Alenoori
Research assistant, Parseh Transportation Institute
Mina Sayadi
Research assistant- Babol noshirvani university of technology
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.
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