What does a double solid yellow line signify?

A double solid yellow line signifies that there is no passing allowed in either direction. This marking is used to indicate that the road is not safe for crossing due to visibility or other hazards. It serves as a strong visual cue to drivers that they must remain in their lane and cannot overtake other vehicles.

The purpose of this road marking is to enhance safety by preventing maneuvers that could lead to head-on collisions. This is particularly important in areas where the visibility may be limited, such as hills or curves. The double solid line reinforces the idea that both lanes of traffic should remain separate and that crossovers are prohibited, thereby promoting safer driving behavior on roads where such a marking is present.