Abstract

Most conflicts occurring in intersections are related to left turn of vehicles. Therefore, transportation engineers use access management as an effective tool to improve arterial ways safety specifications to solve the problem and minimize conflicts. The goal of this study is offering prediction models for conflicts in unsignalized intersection for direct left turn (DLT). In other words, these models analyze safety and performance of DLT and they help managers to select the most suitable movement. To do so, a model is calibrated and offered by effective variables of safety of intersections like: left turns volume, traffic volume, lanes width, etc., four models for conflict rate are offered for DLT. Synchro simulation software was used to validate final models of this study. Regarding to the results, one can examine safety of DLT from Major Street to Minor Street in unsignalized intersections, and can analyze access management techniques to improve safety.

Key words: Conflict, left turn, intersection, simulation, modeling.