This sign means:

No passing zone ahead.
Narrow bridge ahead. Slow down and drive with caution.
Do not enter if your vehicle is taller than the height listed on the sign.
None of the above.
Explanation

The Low Clearance warning sign informs drivers that they are approaching a tunnel or a bridge. If their vehicle is taller than the height listed on the sign, then they are not permitted to proceed.

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This question appears in the following DMV practice tests: