Practice question A MERGE warning sign means: Another lane of traffic joins your roadway aheadYou must stop immediatelyThe road becomes a pedestrian mallA railroad crossing is ahead Answer: A — Another lane of traffic joins your roadway ahead 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 →