alcam
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Railway bridge at Cameron toll in Edinburgh gets hit by trucks about 3 times a year . Height is signposted before the roundabout that precedes the bridge .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.