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What is the meaning of a single solid white line in the center of a roadway?

  1. No passing

  2. Traffic should proceed in either direction

  3. Road ends ahead

  4. Divides lanes for turning

The correct answer is: No passing

A single solid white line in the center of a roadway indicates a no passing zone. This means that drivers are not allowed to pass another vehicle or travel in the opposite direction within that lane. Option B is incorrect because it describes a double solid white line, which indicates that traffic should proceed in the same direction and not cross over. Option C is incorrect because a road ending ahead is commonly marked with a solid white line ending in an arrow pointing towards the direction of the end of the road. Option D is incorrect because turning lanes are typically marked with dotted lines, not a solid white line.