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You will often have to drive your vehicle under bridges and overpasses. If approaching such an opening, you should

A Assume the posted clearance height is inaccurate
Explaination
Do not assume that posted height clearances are accurate. If the road was repaved after the sign was posted, or if there is packed snow on the ground, the actual height of the opening may be different than what is indicated. If you are not confident that your vehicle will be able to safely clear an upcoming bridge or overpass, you should slow down and find another path, if possible. more
B Assume the posted clearance height is accurate
C Measure the height of the opening before proceeding