PURPOSES: This study was done to model the headway distribution of rural two lane roads. METHODS: Time headway data for the various level of traffic volumes was measured in twelve sites. Based on the time headway data, existing seven mathematical models were evaluated and selected by comparing graphically the measured and theoretical distributions and conducting the Chi-square test. RESULTS: The results show that both the Schul model and Composite Model were the most appropriate models of the models. Based on the measured time-headway distributions, this study proposed a new headway distribution model by the shift of the Schul model. CONCLUSIONS : The shifted Schul model has the ability to describe time headway distirbutons for random, intermediate, and constantheadway states.

• 문재필(한국건설기술연구원 수석연구원) | Moon, Jaepil 교신저자
• 김동녕(단국대학교 대학원장) | Kim, Dongnyong