On 04/08/2011 02:03 PM, Nathan Mills wrote: > I think ref=OK 20;AR 42 (or equally ref=AR 42;OK 20) is the appropriate > tag there.
Though a ref with two different states involved is fairly rare, about the only spot I can think of where that would apply offhand would be WA 500 if they ever start running the ferry to Chinook Landing on the Oregon side of the river again (in which WA 500 would run from the landing to Marine Drive in Oregon) or the example you gave of AR 42; OK 20 running down the Arkansas/Oklahoma border. Using the NE2-suggested "SH" or "SR" would definitely be ambiguous in many, if not most, cases (Oregon uses both state highways and state routes (ie, State Route 99E is also State Highway 1E), while Washington only uses State Routes, though in most cases, "SR 10" would be ambiguous since both have them. Likewise, both Oklahoma and Arkansas use State Highways, so "SH 42; SH 20" would be ambiguous to a point of confusion.
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