We try to stay on interstates and US routes. US routes are supposed to be 13'6" minimum. Not always true. There are a few exceptions.
IF we have to take a lesser route we check it against RV Parky to see if there are any alerts.
Then we look at it using Google maps Satellite view to look for anything obvious. Railroad crossings are where you normally find issues. Either a low bridge OR a hump backed crossing that you will bottom out on.
So far we have had only two bad experiences. One in NY on 63 outside Ballston Spa. This one did not even show up on the Truckers Atlas. The road had a sign 5 ton weight limit. Nothing about the low bridge 12' 11" until you got to the bridge. We were lucky there was a baseball field nearby with a parking lot big enough to turn around in.
The second one was on US 1 in Colchester Va. 13'4". We went under it at SLOW walking speed. Made it!!!
3rd picture. Low bridge can also mean
LOW WIRE!!!
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