Final answer:
A low clearance sign is a yellow warning sign with a silhouette of a vehicle and a measurement indicating the maximum height that can safely pass under an obstacle. Drivers should compare this height with their vehicle's height to prevent accidents.
Step-by-step explanation:
The sign indicating low clearance ahead is typically a yellow warning sign featuring a truck or a vehicle with an arrow and a measurement, usually in feet and inches, indicating the maximum safe height for a vehicle to pass under an overhead obstacle, such as a bridge or a tunnel entrance without striking it. It is important for drivers, especially those operating taller vehicles like delivery trucks or RVs, to heed these signs to avoid vehicle damage or a traffic accident.
In most cases, the sign will be rectangular with a black silhouette of a vehicle on a yellow background, along with the measurement clearly displayed. When encountering a low clearance sign, drivers should compare the clearance height with the height of their vehicle and if necessary, find an alternative route that can accommodate their vehicle's height.