Having spoken before with some logistics folks/route planners for large trucking outfits: Its a tricky problem in that it's hard to keep the clearance data curr

Having spoken before with some logistics folks/route planners for large trucking outfits: Its a tricky problem in that it's hard to keep the clearance data current. An example I was given was that routine road maintenance might include resurfacing a stretch of the route. If some asphalt wasn't ground out beforehand, that new lift reduces the height from the road surface to the bottom of the bridge by a couple inches. If that was all the margin you had, clang!