When is it illegal to pass another vehicle?

Passing another vehicle is illegal when approaching a hill or curve because visibility is significantly reduced in these situations. When driving on hills or around curves, the driver may not be able to see oncoming traffic, which increases the risk of a collision. It is essential for drivers to be aware of their surroundings and ensure they can safely execute a passing maneuver. This rule is designed to maintain safety on the road and to prevent dangerous situations where drivers could misjudge distance or speed. In scenarios where visibility is hindered, it is crucial to allow enough space and time to ensure that passing is both safe and legal.