My child asked me why truck drivers and bus drivers in Shanxi Province are afraid of fog, but roller drivers are not. What's a better answer?

The driver of the ordinary car drives fast, both sides are 60 mph, and the relative speed when colliding is 120 mph. If they don't slow down in the fog, the cab will rot directly and the car will be destroyed.

The road press is heavy and its speed is already very low. There is a big roller in front of the cab. Even if it hits, the car will not be scrapped and fly away. When it meets a big car, the driver in the cab is still relatively safe.