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Old 05-01-2019, 04:41 PM   #1
Harreec
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GPS query

When you are entering the data into an RV GPS do you add a safety margin into the height field and if so how many inches. Our RV measures 11’ 11” and I am contemplating boosting that measurement for safety...thoughts ?
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Old 05-01-2019, 04:49 PM   #2
Canonman
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I'd be leery of anything under 14'.
"In the United States, the minimum height of a bridge going over a road is 14 to 16 feet, or 4.3 to 4.9 meters. In general, the minimum height slightly varies depending on the type of roadway."
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Old 05-02-2019, 02:52 AM   #3
OldMasterTech
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I would plug in 12' 6" if it were mine. I have the truck version of the Garmin in my commercial trucks and I find the bridge database weak here in New England. Have had to turn around in tight busy places a few times!
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Old 05-02-2019, 08:43 AM   #4
Tbos
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GPS query

My rig is supposed to be 13’6”. I enter 13’10” so I can go under 14’ bridges. I know I am under 14 because the 14’ over height detectors didn’t flash when I went by and I safely made it under that bridge. I know that’s not the best way to test it but it’s what I had available at the time I was headed down I95.
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Old 05-02-2019, 09:06 AM   #5
hankpage
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Keep in mind that the length of your unit can effect it's height if the overhead obstruction is in a low spot with inclines on both sides. As your TV climbs one side the trailer is still at a high point on the other side making the center measurement higher than on level ground. Don't ask me how I know this.
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Old 05-03-2019, 07:25 PM   #6
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There are quite a large number of bridges or underpasses that are much lower than 13'6", and there are a large number of youtube videos that show the damage done when RV's or trucks attempt to drive through these locations. https://video.search.yahoo.com/yhs/s...d&action=click
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