Commercial Driver's License

Answer: D - The overhead clearance of bridges, overpasses and other structures can vary if the road conditions change. Changes to road thickness can occur because of repaving, packed snow or thick ice. In all these cases, the road may be higher than what it was when the clearance was posted. It only takes a fraction of an inch to cause an accident. If you are not certain that your vehicle can make it under the structure safely, take another route.