Practice question What does a One-Way sign mean? Traffic moves only in the direction of the arrowYou may drive either direction if traffic is clearThe lane is for left turns onlyThe road is a temporary detour Answer: A — Traffic moves only in the direction of the arrow The correct answer is shown above. Try the full quiz for additional practice. Practice more: Maine Road Signs Practice Practice Questions - Maine Driver License Knowledge Test Signs, Signals and Road Markings Practice Exam →