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Old 01-13-2022, 01:45 PM   #1
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18-wheeler height?

Is there a standard height for 18-wheeler trailers?
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Old 01-13-2022, 01:54 PM   #2
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Federal Maximum
!3'6"
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Old 01-13-2022, 02:02 PM   #3
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Low boys to full size box trailers and everything in between.
Must be no higher than 13' 6" but usually a bit lower for a margin of error.
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Old 01-13-2022, 02:41 PM   #4
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Yesterday we were driving behind an 18-wheeler that looked really tall, but we saw him go under a 12'6" train trestle! I thought he was gonna scrape for sure!
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Old 01-13-2022, 02:43 PM   #5
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usually, 13 foot 6 inches. watch your bridges !
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Old 01-13-2022, 03:01 PM   #6
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Standard height for 18-wheeler trailers is 13.5'. This compares to 13.4' for my fifth wheel trailer.

https://streamlogistics.com/trailer-...0(162%20inches)
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Old 01-13-2022, 03:20 PM   #7
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13' 6" ? For some reason I thought they were 14'. Good to know I guess.

My coach is 12' 10" to the top of the AC units. I have always rounded up to 13' for easy remembrance.
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Old 01-13-2022, 04:38 PM   #8
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There is no “standard height” for a tractor trailer. There is though a standard maximum height, 13’6”, that the semi can’t exceed without over height permitting.
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Old 01-13-2022, 07:35 PM   #9
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As a general rule most Western States allow 14', even CA. But rest assured the operator is responsible for any "Oops!" that happen.
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Old 01-14-2022, 07:25 AM   #10
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Quote:
Originally Posted by MSHappyCampers View Post
Is there a standard height for 18-wheeler trailers?
Many, many, years ago when we were still boating, we forgot to take our expensive fishing rods out of the rocket launchers on our radar arch. The top of the arch was at 12’6”. When we got home, the reels were still in place, but the rods were about 2’ long. Funny to us now.
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Old 01-14-2022, 07:40 AM   #11
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I drove trucks in the LTL (less than trailer load) for about 40 years. We covered all of the lower 48 states and any one of our trailers, which were marked 13’6”, could end up in any state. All of the major players in the freight industry are the same. The only exception was trailers used specifically for city use. I would venture to guess that at least 90% of the semi trailers you see are 13’6”.
Here’s something to think about though, if the bridge signage says you have an inch of clearance and you run over a 2X4 board under the bridge your suspension may not compress enough to prevent you from scraping the top��
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Old 01-14-2022, 10:05 AM   #12
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Another point to think about is one side of the bridge may say 13'-6" (going north bound) and the other side could say 14' (going south bound) on the same roadway. I have seen this many of times when passing under a railroad bridge. Also, if in question of the bridge height travel in the left lane on a four-lane highway or over to the center if possible. Since the 13'-6" is measured from the lowest point of the road surface.
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Old 01-14-2022, 10:10 AM   #13
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Plus there is no way to know how many layers of new pavement have been added since the sign was placed. Considering a margin of error is a wise thing.
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Old 01-14-2022, 12:12 PM   #14
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all trucks are 13'6" max from the ground. thats standard. could be shorter but not overe without permits
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