The selection of acceleration and deceleration lane length based on land-saving interchange

On the premise of guaranteeing the capacity and traffic safety of interchange, saving land usage as the fundamental purpose, from the perspective of driver´s psychology and physiology response, based on a number of actual measured data, around speed consistency theory, using the research methods of operating speed contrast and driver´s psychology and physiology characteristics, the paper establishes a mathematic model of the relationship between shift lane length and speed contrast, then analyzes the technical indicator of shift lane of land-saving interchange. This paper proposes the recommended value of acceleration lane and deceleration lane length, which will provide theoretical basis for interchange design and planning and so on.