On 07/28/2009 11:45 AM, Christoph Böhme wrote: > According to Wikipedia "clearance" [1] is the free space between a > vehicle and the structure (i.e. bridge) it is passing through. The > maximum height (and width) of the vehicle is -- at least for railways -- > called "loading gauge" [2] while the dimensions of the structure are > called "structure gauge [3]. Thus, what we find on signs is the loading > gauge.
It may also be worth mentioning that there's another meaning of "clearance" when referring to vehicles: that of the free space beneath a vehicle (ground clearance). So it would seem that "clearance" always refers to "free space below" -- meaning that it's the bridge's clearance that is marked. This does not contradict that it is also the loading gauge of the vehicles passing underneath it... -Alex Mauer "hawke"
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