When should vehicles on the side of a steep drop stop?

The correct answer emphasizes the importance of safety in situations where there is a steep drop. Vehicles on the side of a steep drop should stop when it is not possible to pass oncoming vehicles safely. This is crucial as the presence of a steep drop often means that the road may be narrow or that visibility is limited. If there is not enough space to allow oncoming vehicles to pass without risk of veering off the road or falling, stopping is the safest option to prevent accidents.

Ensuring that there is adequate room for safe passage is a fundamental principle of safe driving, particularly in challenging environments like those with steep drops. This choice reflects a responsible and cautious approach to driving, prioritizing the safety of all road users.