When is passing another vehicle prohibited?

Passing another vehicle is prohibited on or near the top of steep grades because visibility is significantly reduced in these areas. When approaching or navigating the crest of a steep hill, drivers cannot see if there is oncoming traffic, which creates a higher risk of accidents. The inability to judge the situation accurately increases the likelihood of a dangerous passing maneuver, as drivers may not be aware of approaching vehicles or other hazards on the road. This regulation is in place to enhance safety for all road users by preventing risky behavior in situations where visibility is compromised.