What does a solid double yellow line indicate?

A solid double yellow line is a clear and definitive road marking used to convey specific traffic rules regarding lane usage. It indicates that no passing is allowed in either direction. This means that vehicles traveling in either lane must remain in their respective lanes and refrain from crossing the double yellow line to overtake other vehicles. This regulation is designed to enhance safety, especially on roads where visibility may be limited or where passing could lead to dangerous situations.

The presence of a solid double yellow line suggests that the area may have increased risks, such as curves, hills, or other factors that make passing hazardous. Motorists should understand that this marking is a strong warning about the dangers of attempting to overtake a vehicle in such zones. In contrast, other road markings and signs govern different traffic behavior, such as parking restrictions or turning regulations, but a solid double yellow line specifically addresses the prohibition on passing.