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Old 07-12-2016, 07:46 PM   #1
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Overpass clearance

Over the past couple days I've been traveling from Illinois through Pennsylvania and New York heading to Maine. With the exception of some surface streets around NYC, all interstate travel. The CB antenna on my coach is about 13'7" off the ground. I can't believe the number of times the antenna hit the underside of an overpass. A couple of bridges I hit were posted with signs indicating clearance of 14'! I cleared others posting lower heights. This is crazy! According to the Federal Highway Safety Administration, interstate vertical clearance is not supposed to be less than 14'. I saw many, many bridges posted less than 14'. Most of my issues occurred on I-95 between New York and Providence, Rode Island. Thank goodness the antenna is mounted on a spring base, but it sure gets your attention when it hits. I will be removing it before I head out tomorrow. I have traveled throughout the midwest, south, and west and never experienced this on interstates.

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Old 07-12-2016, 08:01 PM   #2
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I see a,lot of overpasses around here at 13' 6"

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Old 07-12-2016, 08:21 PM   #3
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13'6" was the standard for the National Highway System for many, many years, so older underpasses were often built to that standard. Plus, it only applies to highways that are part of the National Highway System (US and Interstate routes), so state and local roads can be built to lesser standards. Last, many of the roadways and bridges in the eastern US were established long before there even were highway standard, so they are either grandfathered in or have been granted exceptions.
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Old 07-12-2016, 08:34 PM   #4
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I used to drive tractor trailers which were all 13' 6" tall. I had my CB antennas mounted so they ran a couple inches over the trailer and I ran every inch of I-95 without tapping any overpass.

Any chance your measurement might be off or your ride height changes when on the road?

I'm not saying you are wrong but I would have to think there would be some big issues if clearance on such a major road was that close.
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Old 07-12-2016, 08:42 PM   #5
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Sometimes a road is resurfaced with another layer of asphalt and the contractor fails to remove the old surface so it may reduce the clearance under a bridge overpass. Normally they would remove the old asphalt before putting a new layer down so clearances are unchanged but that doesn't always happen, low bidder gets the job. On the PA turnpike the overpasses are arched so max clearance is in the center of the 2 lanes. Federal standards for as mentioned on Interstate and US Highways the height should be no less than 13'6" actually I believe 14' is the standard. That is why trucks/trailers are manufactured to federal mandated max height of 13'6". There are of course exceptions for special transport on height as well as weight.
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Old 07-13-2016, 05:52 AM   #6
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Gee...I've been lucky so far. I've touched tree leaves & branches but not overpasses yet. Generally signs are correct and posted but we don't live in a perfect world. Driving old cities like Chicago or New York you'll always encounter low overpasses. Like the student that was test driving, I asked him what the height was after we went under the overpass, and without a blink of an eye, he came back 14' 6". Nice try. The overpass wasn't posted. Like Tom said , check your measurements and if you have to back out of a problem best you contact law enforcement first.
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Old 07-13-2016, 06:01 AM   #7
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If I were the OP I'd be re-measuring the coach on a level surface at full ride height just to make sure of exactly what his true height really is.

Something sure sounds fishy.

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Old 07-13-2016, 06:38 AM   #8
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Ours is <12' at ride height.....
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Old 07-13-2016, 06:51 AM   #9
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Old 07-13-2016, 10:23 AM   #10
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Hopefully my trucker GPS will keep me away from those bridges....
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Old 07-13-2016, 10:32 AM   #11
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moleary, I think your airbags may have been deflated when you did the measurement. Might do it again with it running.

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