What does a solid double yellow line indicate?

A solid double yellow line indicates that passing is not allowed. This marking serves as a clear visual message to drivers that they should not cross the lines to overtake another vehicle. It's commonly found on two-way roads where the potential for head-on collisions is higher. The solid nature of the lines emphasizes that safety is a priority, and it is crucial for drivers to adhere to this rule in order to maintain safe traffic flow and reduce the risk of accidents. By keeping respect for these markings, drivers can contribute to safer road conditions for themselves and others.