As shown in the figure, it is a schematic diagram of the escape lane of the expressway, showing the function of paving pebbles.

The function of paving small stones in the refuge lane is to increase the buffer and friction resistance, so that the out-of-control vehicles are trapped inside until they stop.

Avoidance lane refers to a special lane added on the outside of a long and steep downhill section for vehicles with out-of-control speed to slow down safely when leaving the main line.

Avoidance lanes are mainly composed of approach roads, brake lanes, service lanes and auxiliary facilities (roadside guardrails, anti-collision facilities, rescue anchors, emergency calls and lighting).