Abstract
Surrogate safety measures (SSM) as indicators of accidents are useful tools in safety evaluations. Nowadays, developing intelligent vehicles without drivers in order to reduce the human errors is a popular topic in civil engineering. Such vehicles are equipped with intelligent collision avoidance systems (CAS), in which safety indicators are applied as warning strategies. Heretofore, different safety indicators have been developed, but most of them are suitable for rear-end conflicts. In this paper, a new framework is proposed to calculate the risk of sideswipe collisions at each instant based on SSM. For this purpose, time-to-collision (TTC) and post-encroachment time (PET), as the most important time-based indicators would be applied and a new method would be presented to calculate these indicators. The application of the framework is illustrated by microscopic traffic data for an arterial road. In all, the new framework has three main applications: 1- As a warning strategy for CAS, 2- Specifying dangerous positions and 3- Identifying aggressive drivers.
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