Practice question A green arrow lane-use signal over a lane means: You may drive in that laneYou must leave the lane immediatelyThe lane is closed aheadThe lane is for left turns only Answer: A — You may drive in that lane The correct answer is shown above. Try the full quiz for additional practice. Practice more: DC Road Signs Practice Practice Questions - District of Columbia DMV Knowledge Test Signs, Signals, and Markings Practice Exam →