Can you always trust posted signs to tell you how high a bridge is?

The statement indicating that you cannot always trust posted signs to tell you how high a bridge is is correct, as bridge clearance signs can sometimes be misleading or outdated. For instance, factors such as roadway changes, construction activities, or shifts in ground elevation might not be reflected in the posted information. Additionally, the height of the bridge may vary due to weather conditions or the potential for the bridge to settle over time.

It's important for drivers, particularly those operating large vehicles, to remain cautious and consider that the information might not be completely reliable. This awareness can help prevent situations where a driver attempts to pass under a bridge that is lower than expected, which could lead to accidents or damage to their vehicle. Therefore, while the signs are meant to provide guidance, they should not be the sole source of information regarding clearance.