Question Passing is prohibited: Answers Within 100 feet of an intersection or railroad crossing. If the vehicle you are following has a slow-moving vehicle symbol. When using the right lane to pass a left-turning vehicle. Explanation It is against the law to pass any vehicle within 100 feet of a railroad crossing or intersection. Only pass where it is safe and legal to do so. Take a FREE Practice Test Now This questions appears in the following tests: Iowa Practice Test