Practice question What does a LEFT LANE MUST TURN LEFT sign mean? Left-lane drivers may go straight if no one is behind themLeft-lane drivers must turn leftAll lanes must turn leftOnly buses may turn left Answer: B — Left-lane drivers must turn left The correct answer is shown above. Try the full quiz for additional practice. Practice more: Indiana Road Signs Practice Practice Questions - Indiana BMV Knowledge Exam Signs, Signals and Markings Practice Exam →