This sign indicates:

The maximum width of a vehicle allowed on the highway.
A steep grade is ahead.
The maximum legal height allowed in this State.
The overpass ahead has a low clearance.
Explanation

This sign is a low clearance warning. It's commonly posted on an underpass, or at the entrance to a tunnel or parking garage. If your vehicle's height exceeds the limit listed on the sign, you should not proceed. Entering with a taller vehicle may result in a collision or getting stuck.

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This question appears in the following DMV practice tests: