Practice question A red X lane-use signal over a lane means: Do not drive in that laneThe lane is open to all trafficThe lane is a tourist routeThe speed limit is higher in that lane Answer: A — Do not drive in that lane The correct answer is shown above. Try the full quiz for additional practice. Practice more: Iowa Road Signs Practice Practice Questions - Iowa Driver's License Knowledge Test Road Signs, Signals, and Pavement Markings Practice Exam →