Evaluation and Analysis of Traffic Headway Characteristics on Rural Freeways

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Mirzarazi Dehaghi, Ehsan | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40226 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Nassiri, Habibollah
Abstract:
Vehicle headway distribution plays an important role in various traffic engineering aspects such as capacity and level of service analysis and simulation issues. Although many headway models have been developed over the past decades, few have investigated the effects of vehicle’s type and its position in the traffic lanes on headway distributions. In this research, time headway data were collected at three different freeways using video camera. The collected data were analyzed and modeled for four different categories (i.e., car-car, car-truck, truck-car, and truck-truck) and under two traffic conditions of platooning and non-platoonig. Four types of probability distribution functions of exponential, shifted exponential, gamma, and lognormal were used to fit the data. The Kolmogorov-Smirnov test was used to test the goodness-of-fit of the selected headway models. The results show that lognormal distribution provided a better fit to the data.
Keywords:
Probability Density Function ; Maximum Likelihood Estimation ; Time Headway ; Kolmogrov-Smirnov Test