Practice question A green arrow over a lane-control signal means what? The lane is closed aheadYou may use that laneThe lane may only be used for a left turnYou must leave the lane immediately Answer: B — You may use that lane The correct answer is shown above. Try the full quiz for additional practice. Practice more: Hawaii Road Signs Practice Practice Questions - Hawaii Driver License Knowledge Test - Road Signs, Signals, and Markings Practice Exam →