In which situation is very slow driving particularly dangerous?

Very slow driving is particularly dangerous after passing the top of a hill due to visibility issues and the potential for unexpected encounters with other vehicles. When a driver approaches or has just passed the apex of a hill, their line of sight is often limited. If a vehicle is moving significantly slower than the typical speed limit, drivers coming over the hill may not have enough time to react or adjust their speed, leading to very risky situations, including rear-end collisions.

This scenario emphasizes the importance of maintaining a reasonable speed that aligns with the flow of traffic, especially in areas where visibility is compromised. When vehicles are traveling at drastically different speeds, it can lead to confusion and hazardous conditions for all drivers on the road.