Practice question What does a ROAD CLOSED FLOODING sign require you to do? Use an alternate routeDrive through if the water looks shallowProceed only in four-wheel driveFollow the vehicle ahead through the water Answer: A — Use an alternate route The correct answer is shown above. Try the full quiz for additional practice. Practice more: PA Road Signs Practice Practice Questions - Pennsylvania Knowledge Test Signs, Signals, and Pavement Markings Practice Exam →