Which situation allows for crossing a solid white line to pass a vehicle?

Crossing a solid white line is generally prohibited because it indicates that such action could be hazardous or is not permitted. However, there are certain circumstances where it may be justified, and one of those is when the vehicle in front of you is a road maintenance vehicle traveling below a certain speed, as in the scenario provided by this choice.

When a road maintenance vehicle is moving at a speed of less than 10 mph, it creates a situation where other vehicles may need to bypass it for safety and efficiency reasons. This scenario falls within a safety provision, where the need to maintain traffic flow and prevent extended delays allows for this infraction of the solid white line rule. It's a case where consideration for road conditions and vehicle speeds warrants a deviation from normal traffic regulations in order to ensure smooth and safe vehicle operation.

Other conditions, such as merely being at night, do not inherently change the traffic laws regarding solid white lines. Similarly, passing when the vehicle is stationary or due to slow traffic ahead may not provide a justifiable or safe condition to cross that line, as safety and traffic regulations prioritize consistent adherence to road markings unless a specific condition allows for the exception.