Watch out for dodgy bridge signs

Pudsey Bear said:
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BRIDGE TO FAR.jpg
 
The guy actually says why there's a discrepancy: it's to do with the way that the numbers are calculated and the 'algorithm' is different for Imperial and Metric. The indicated clearance is always less than the actual clearance; it's the 'safety fudge factor' that differs.
 
I get very bored with those Youtube videos that spend 20 minutes telling you something that should take 1 or 2 at the most..

I was trying to do something with my Huawei Watch & the 'Health' App a couple of days ago and resorted to an internet search ... found a Youtube video that told me exactly what I needed to do and the entire video was 41 seconds long. Now THAT is how to do it (y)
 
barryd said:
20 minutes to tell us whats up with bridge signs?

I Can summarise without watching. Ones in metres and the other is in feet and if its 3m or less, duck if you go under with the van. :D
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Maybe you should have watched it all then as you missed the point of the video.
 
wildebus said:
I get very bored with those Youtube videos that spend 20 minutes telling you something that should take 1 or 2 at the most..

I was trying to do something with my Huawei Watch & the 'Health' App a couple of days ago and resorted to an internet search ... found a Youtube video that told me exactly what I needed to do and the entire video was 41 seconds long. Now THAT is how to do it (y)
Click to expand...
32 seconds was enough
 
I've not watched the video and have no intention of doing so as these things just bore me. But as an ex-truck driver what I can they you is that in the UK any bridge sign MUST display a height at least 3" below the measured height.

Each authority apply their own minimum "clearance" so the actual height for the same bridge could vary greatly, So a 14' bridge in Cheshire could be signed at 13' and in Hampshire it could be 13'6" and Warwickshire it could be 13'9'

Then things get worse there are 39.37" in a metre, but most authorities use 39" for conversion while some use 39.37" some (to be safe) use 36"

So a discrepancy between feet and meters across the road network is inevitable.

But none of this is generally important in a motorhome or van as the number of bridge restrictions effecting these vehicles is minimum and the signs will always be on the safe side.

This becomes an issue with higher vehicles really, to the point that when running high abnormal loads we used to actually run the route in a van and measure the bridges ourselves in areas we hadn't been before (turning around in STGO Cat3 ain't a joke)

Out of interest the worse County for inaccurate bridge heights was Buckinghamshire by a mile.
 
I always wonder where the height is measured.

Because of the curvature of some bridges the height will decrease further away from the centre, therefore, the wider the top of the vehicle the less clearance there will be?
 
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