What does a solid white line on the road mean?
Answer: B — No passing allowed.
A solid white line on the road typically means that passing is not allowed. Option A is incorrect because a solid white line has a different meaning than a sign with the words "No stopping or parking" on it. Option C is wrong because a solid white line does not have the same meaning as a sign that specifically prohibits left turns. Similarly, option D is incorrect since a solid white line does not have the same meaning as a no right turn sign.