What does a solid double yellow line indicate?

A solid double yellow line indicates that passing is prohibited in both directions. This means that vehicles on either side of the line must remain in their respective lanes and are not allowed to cross the line to pass another vehicle. The purpose of this traffic marking is to ensure safety on roads where visibility may be limited or where passing could be hazardous, such as on curves or hills. Recognizing and adhering to this rule is essential for avoiding collisions and maintaining safe driving practices.