Abstract
This study analyzes the impacts of the effective space on speed of various vehicles categories, dynamic motorcycle unit and mean stream speed under mixed traffic conditions on urban roads. Data was collected at three link roads of streets, namely Cau Giay, Hang Bot and Nguyen Luong Bang street in Hanoi. This study estimated the relationship between speed and effective space associated with various categories of vehicles. Dynamic motorcycle unit (DMCU) values were calculated and suggested that the impacts of space occupancy of vehicles on mean stream speed should be given special consideration. Different from projected rectangular area on ground, the factor for estimating area of vehicle occupying on ground as the required space, the boundary around vehicle including intersection area from other vehicles, is introduced to reflect DMCU more dynamically and accurately.
