Iowa Motor Vehicle Law Practice Test

A solid yellow line on the road indicates that no passing is allowed for vehicles traveling in either direction. This marking is intended to enhance safety by preventing overtaking in areas where visibility might be limited or where conditions are considered dangerous for passing. The presence of a solid yellow line signifies that it is illegal to cross over the line to pass another vehicle, so drivers are expected to remain in their lane and not attempt to overtake other vehicles in that section of the roadway.

The other options do not accurately reflect the purpose of a solid yellow line. For instance, passing being allowed or left turns being permitted contradict the intention behind this kind of road marking. Additionally, the prohibition of parking is not relevant to the meaning of a solid yellow line, which focuses specifically on driving behavior related to passing. Therefore, a solid yellow line clearly conveys a restriction on passing to maintain safe driving conditions.