Under what conditions is it illegal to pass another vehicle?

Passing another vehicle is illegal on a hill or curve because these areas are typically marked as no-passing zones due to limited visibility and increased risk of accidents. When driving on hills or curves, your line of sight to oncoming traffic is often obstructed, making it difficult to determine whether it is safe to pass. This regulation is in place to enhance safety on the road, preventing collisions that could occur if a driver attempts to overtake another vehicle without adequate visibility.

In contrast, passing is permitted when the line is dashed, which indicates that it is safe to do so under the right conditions. Daylight hours do not inherently affect the legality of passing. Furthermore, the presence or absence of other vehicles does not alone dictate when passing is allowed; safe passing depends on road conditions and visibility rather than vehicle presence.