What does a solid line on the road indicate?

Answer: B — No passing is allowed

A solid line on the road indicates that no passing is allowed. This type of line serves as a warning to drivers that the conditions do not permit safe overtaking of another vehicle. It is typically used in areas where visibility is limited or where it would be dangerous to cross into the opposing lane, such as on curves, hills, or intersections. Maintaining the safety of all road users is crucial, which is why this visual cue is essential in encouraging drivers to adhere to speed limits and stay in their designated lane. Understanding road markings like solid lines helps ensure a safer driving experience by promoting responsible driving behavior.