1on the expressway, maintain a 3-4 second following distance. if the road is slippery or wet, adjust your distance to

6-8 seconds

Explanation:

On the expressway, we should maintain a 6-8 second distance to avoid accidents in case of any misshapen.

6-8 second distance here refers to the distance traveled by vehicle in 6-8 seconds. The wet surface automatically decreases the friction force because it acts as a lubricant . Low friction meaning the low value of declaration and thus require a large value of distance to stop in case of emergency. Large distance meaning the large value of time to stop.    

answer; migrate from a region;

can you explain it better