What is the meaning of a solid double yellow line on the road?

Answer: B — No passing is allowed

A solid double yellow line on the road serves a specific purpose in traffic regulation. It indicates that no passing is allowed for vehicles traveling in either direction. This is typically used in areas where visibility is limited or where passing could be particularly dangerous due to road conditions, such as curves or hills. The solid line effectively communicates to drivers that they should not change lanes or overtake another vehicle in these areas, ensuring the safety of all road users. In contrast, the other options imply varying degrees of flexibility regarding lane usage or passing, which is not indicated by a solid double yellow line. Therefore, understanding this marking reinforces safe driving practices and awareness of traffic rules.