A safe way to approach the issue of overhead clearance is ...
Answer: Hitting overhead objects is a danger. Make sure you always have overhead clearance. Before you back into an area, get out and check for overhanging objects, such as trees, branches, or electric wires. It's easy to miss seeing them while you are backing. Check for other hazards at the same time. Don't assume that the heights posted at bridges and overpasses are correct. Repaving or packed snow may have reduced the clearances since the heights were posted. If you doubt that you have safe space to pass under an object, go slowly. If you aren't sure you can make it, take another route. Warnings are often posted on low bridges or underpasses, but sometimes they are not.
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