This sign indicates:

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The maximum width of a vehicle allowed on the highway.
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A steep grade is ahead.
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The maximum legal height allowed in this State.
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The overpass ahead has a low clearance.
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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 road sign means:This question appears in the following DMV practice tests:
South Carolina DMV Practice Test 1Massachusetts RMV Practice Test 1Georgia DMV Practice Test 3Hawaii DMV Practice Test 4Wisconsin DMV Practice Test 5North Carolina DMV Practice Test 5New Jersey DMV Practice Test 8Arizona DMV Practice Test 8Iowa DMV Practice Test 9District of Columbia DMV Practice Test 9