What does a "Low Clearance" sign warn drivers about?

A "Low Clearance" sign serves as a warning specifically for vehicles that may be taller than the designated height limit indicated on the sign. This alert is crucial for drivers, particularly those operating larger vehicles, to prevent potential accidents or damage that could occur if they attempt to pass under a structure like a bridge or overpass with insufficient height clearance.

The sign does not mean that the structure is too high for vehicles in general, nor does it restrict only trucks from proceeding. In fact, while trucks are often taller and might face clearance issues, the warning applies to all vehicles that exceed the listed height, including vans, buses, and any other taller vehicles that might encounter the same problem. Additionally, the sign does not outright prohibit all vehicles from passing underneath; it simply informs them to assess their own height before proceeding, allowing drivers to make informed decisions to avoid hazardous situations.