This road sign means:

This sign is the Low Clearance warning sign. This road sign alerts drivers to an upcoming bridge, overpass, or overhead obstruction with limited vertical space. The posted height (n this case, 13 feet 6 inches) indicates the maximum safe clearance; vehicles exceeding this height must not proceed and should seek an alternate route. This sign is placed well in advance to provide adequate warning, as attempting to pass under a low clearance risks severe vehicle damage, or even structural collisions. Always obey posted height restrictions and watch for detour signage if your vehicle exceeds the limit.

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