When a vehicle leaves an expressway, it should reduce speed in the decelerationlane before entering the ramp.
车辆驶离高速公路时，应当经减速车道减速后进入匝道。
2
Interchange is an important part of expressway, and the decelerationlane of interchanges and the diversion point are important indexes of alignment design of interchanges.
The bridge decking width adjustment design was introduced to solve the problem of consistency between the outside profile of acceleration-decelerationlane and road alignment.