I'm not sure when it changed or if it changed, and the info I have gotten is nebulous at best, but it's surely something. It may be longer than 200 mi. Look at the MT/SD example about 8-10 posts up. The couple dozen miles of Minor Highway in the middle of US-212 led to that route's pruning even as an alternative route.
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Re: Road Types (USA) – comprehensive overhaul of drivable ro