Interchange is an important part of expressway,and the deceleration lane of interchanges and the diversion point are important indexes of alignment design of interchanges.

The paper discussed the design methods of deceleration lane and the choice of controlling parameters near the diversion point,and proposed some problem.

Based on vehicle driving simulator experiments,the autoregressive model predicting the operation speed on the acceleration and deceleration lane was developed under atrocious weather condition.

Study and Experiment on the Retarded Down Grade Lane for Continuous Long and Steep Downgrade Sections in Mountain Terrain;