Abstract:

The operation processes of vehicles are analysed for both direct leftturn and rightturn combined u-turn(RTUT) at the edian opening at unsignalized T intersection. The calculaiton models for travel time and stop delay are developed to describe these two situation, which are based on the gap acceptance theory. Both the status of tranfic flow of major road and the geometry parameters of the section are involed in the models, which is different from other research findings. Hence, the models could be adopted for the evaluation for all kinds of implements of RTUT. Moreove, the comparion results which are derived from the calculation example are consistent with the known findings.

Key words: engineering of communications and transportation, gap acceptance theory, direct left turn, U-turn and right-turn, travel time model