What is prohibited on the traveled portion of a highway?

Stopping on the traveled portion of a highway is prohibited because it poses significant safety risks for both the stopped vehicle and other road users. When a vehicle is stopped in a lane of traffic, it can lead to unexpected collisions, as other drivers may not have sufficient time to react or safely maneuver around the obstruction. Highways are designed for smooth traffic flow, and any interruption can cause delays and increase the likelihood of accidents.

In contrast, making U-turns, parking, or dismounting the vehicle are typically subject to specific regulations or designated areas, but they do not generally apply to the ongoing movement of traffic on the highway itself. Stopping, however, can create hazardous conditions, especially if the vehicle is not in a designated area for stopping or breakdowns. Therefore, the prohibition on stopping is focused on maintaining safety and efficient traffic flow on highways.