1
M.sc, Civil Engineering Department of Islamic Azad University of Shahrood, Iran
2
Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran
Abstract
Drivers' behavior is one of the factors influencing the performance of U-turns. By studying and evaluating drivers’ behavior, delays and traffic congestion in U-turns are controlled. Therefore, the purpose of this study is to evaluate drivers’ behavior in one way developed and uncontrolled intra-city U-turns using collecting data. At the beginning of this study, in order to achieve parameters of the capacity estimation model such as the critical gap acceptance, the follow-up time, data were collected in one way developed U-turns during peak traffic hours in the city of Tehran during the day. Then, the results of the critical gap acceptance and follow-up time were obtained 3.10 and 2.20 seconds, respectively. Finally, comparing the critical gap acceptance and follow-up time, according to the HCM 2000. It was concluded that 40% Iranian drivers are not following the right of way when entering into one way developed U-turns that are causing traffic congestion and delays.