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.