What does a double solid line indicate on the road?

A double solid line on the road signifies that no crossing is allowed. This marking indicates that vehicles must not cross these lines to overtake or change lanes. It often appears in areas where visibility is limited or where it is particularly dangerous to change lanes, such as on hills, curves, or near junctions. This rule is in place to maintain safe travel conditions and reduce the likelihood of accidents in high-risk areas.

The other options do not accurately reflect the meaning of a double solid line. For instance, crossing with caution is not permitted, as the line explicitly indicates that changes in lane or overtaking are prohibited. Similarly, passing is discouraged in these zones because of safety concerns. Lastly, while some road markings might provide specific directions like permitting certain turns, the presence of a double solid line does not allow for any turns, such as right turns, across this marking. Understanding the significance of these road markings is crucial for maintaining road safety and adhering to traffic regulations.