Good Sam Club Open Roads Forum: Beginning RVing: Overhead Clearence
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Beginning RVing

Open Roads Forum  >  Beginning RVing

 > Overhead Clearence

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Land Yachters

Philadelphia

New Member

Joined: 08/17/2019

View Profile



Posted: 05/28/20 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

So just driving our Tiffin 33 around for first time. It shows 13' height, (which I have not yet verified) but was wondering about the accuracy of clearance signs along the road. If the sign says 13'0", can I trust that?
Didn't see this question posed elsewhere, so thought I would ask.
Thanks
Griff


Land Yachters
Philadelphia, PA
2018 Tiffin 33aa

Allworth

Orlando, FL

Senior Member

Joined: 10/10/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 05/28/20 12:53pm Link  |  Quote  |  Print  |  Notify Moderator

With some warnings, they are fairly accurate. Federal Highway Admin design standards require that they be within 2 inches at time of construction.

However....

1. States have uniformly adopted FHWA standards. Cities and Counties are on their own. Nobody deliberately miss-marks a clearance, but some may not be marked at all.

2. Maintenance agencies tend to leave old signs in place when they repave (except on Interstates) and paving can raise the road surface as much as 1.5", reducing clearance.

3. 13'- 6" is minimum for federal and state roads without advanced warning signs. Minimum is measured at the closest point between the road surface and the bottom of the overhead structure; usually at the right edge line of the right lane.

4. Confirm your actual highest point. (RV manufacturers frequently forget air conditioners or sat dishes) Measure with the unit loaded for travel and the air suspension (if equipped) pumped up. My trailer is 12' - 9" over the front AC. I approach anything less than 13' - 3" (six inches clear) with extreme caution. My height in English and Metric units us written in large letters on a card taped to the driver's sun visor.

A


Formerly posting as "littleblackdog"
Martha, Allen, & Blackjack
2006 Chevy 3500 D/A LB SRW, RVND 7710
2008 Titanium 30E35SA; EZ-Lube axles; wet bolts; spring hanger gussetts; BFG Commercial TAs
"Real Jeeps have round headlights"

Desert Captain

Tucson

Senior Member

Joined: 02/19/2011

View Profile


Offline
Posted: 05/28/20 01:15pm Link  |  Quote  |  Print  |  Notify Moderator

Allworth, good info especially #2. In rural areas roads get repaved over and over and they can be significantly taller than that height sign indicates, which was usually posted back when God's dog was a puppy. Like you, I add 6" to my actual height, yes I measured twice and then once again until I got the same number three times...

Some places that have tunnels can pose a whole new set of problems, the Blue Ridge Parkway comes to mind. Some of those tunnels are ridiculously low as you get near the right side of the lanes. I see posts just telling folks no problem just stay in the center {over the double yellow} but as a guy who rides motorcycles I take serious offense at that lame advice.

Bottom line, not every RV can safely transit every road. I just wish more folks would realize that and stick to roads that their rigs and skill levels match. Rant off... for now.

[emoticon]





DrewE

Vermont

Senior Member

Joined: 08/23/2014

View Profile


Offline
Posted: 05/28/20 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

You'll get a variety of opinions.

From what I understand, very rarely if ever are clearances less than the listed amount; generally the actual clearance is slightly (or sometimes not so slightly) more so as to account for the possibilities of repaving, frost heaves, settling of the foundations of whatever is overhead, vehicles bouncing as they travel, etc. That said, it is not a bad idea to be cautious about these things. At the very least do measure your actual clearance requirements for yourself, and maybe consider putting it on a card or sticker on the dashboard for reference. (It can be useful to have your actual overall length and width ready at hand, too; if you have rear view mirrors that can be folded in, the width both with them folded and with them deployed is occasionally handy to know.)





wa8yxm

Wherever I happen to park

Senior Member

Joined: 07/04/2006

View Profile


Offline
Posted: 05/28/20 04:26pm Link  |  Quote  |  Print  |  Notify Moderator

First the good news. Odds are your rig is no longer 13' tall. that is the "Dry" weight empty before you stock up for the trip.. It gets shorter. BUT.. How much???

Second.. if I was approaching a sign that says 13' With that rig... Well.. Very very very cautiously (Been there done that but at 12'6" with my rig.. I cleared)

I wish they would do more "If you hit this you WILL hit that" signs.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


pigman1

Delaware

Senior Member

Joined: 06/28/2004

View Profile


Offline
Posted: 05/28/20 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

Just to tell you how that clearance sign came to be. Let's assume the road was repaved. Someone will make a WAG (wild a$$ guess) post a temporary sign, you hope, and call the road department. They will send out a survey crew who will actually measure what the clearances are and report it back to the office. Short as a couple of days to a week or longer. The office calls the sign shop (or sends them a work order) and the necessary signs are made (assuming materials available). Once they are made, the signs go back to the highway office where a work crew is scheduled to put the signs in the correct location re the bridge. Maybe another survey crew is sent out, or not to locate the true sign, and maybe the signs are finally put up for all to see. Time? A couple of weeks for the Superman of the road departments, to 2-3 months which would think is about average. BTW, I worked in the department that generally oversaw these actions in the city of Newark, NJ, a long time ago, but I doubt things like this change.


Pigman & Piglady
2013 Tiffin Allegro Bus 43' QGP
2011 Chevy Silverado 1500
SMI Air Force One toad brake
Street Atlas USA Plus

Dutch_12078

Winters south, summers north

Senior Member

Joined: 10/07/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 05/28/20 07:20pm Link  |  Quote  |  Print  |  Notify Moderator

I've seen state highway overpass signs in NY being updated while the contractor was still compacting the new blacktop.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate


pigman1

Delaware

Senior Member

Joined: 06/28/2004

View Profile


Offline
Posted: 05/28/20 08:18pm Link  |  Quote  |  Print  |  Notify Moderator

Dutch_12078 wrote:

I've seen state highway overpass signs in NY being updated while the contractor was still compacting the new blacktop.
Yeah, that too. It all depends on how the contract was written.

valhalla360

No paticular place.

Senior Member

Joined: 08/19/2009

View Profile



Posted: 05/29/20 05:14am Link  |  Quote  |  Print  |  Notify Moderator

I work in the field and you are getting a lot of misinformation.

No one is building overpasses without detailed plans and surveyors on site. And they do field verify it was built to plan. A high load hit is a huge hassle.

Even with resurfacing projects, they verify the clearance.

Keep in mind, they build in some fudge factors. They typically list a height that is a few inches lower than reality. Also, the listed height is at the shortest point. Road surfaces crowned meaning there is a high point so water runs to the sides. If you aren't at the crown point, there is more clearance.


Tammy & Mike
Ford F250 V10
2008 Copper Canyon 5er
Catalac Catamaran 34'
Full Time spliting time between boat and 5er


pigman1

Delaware

Senior Member

Joined: 06/28/2004

View Profile


Offline
Posted: 05/29/20 07:06am Link  |  Quote  |  Print  |  Notify Moderator

Well and good. I worked the survey parties that went into the field to verify that the job was completed according to the contract engineering plans and drawings. I also worked in the engineering office where the necessary work orders were drawn up and forwarded to the other sections for actions. What they're doing now, I don't know, but I watched how it worked when I worked there.

As Dirty Harry said "Are ya' feelin' lucky, P____?" My suggestion. Know your height by measuring it. If you have any question, go another way or hang on the ladder with a phone and look close while someone creeps under the bridge.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Beginning RVing

 > Overhead Clearence
Search:   Advanced Search

Search only in Beginning RVing


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2020 CWI, Inc. © 2020 Good Sam Enterprises, LLC. All Rights Reserved.