Is one mile of each five in the Interstate system required to be able to act as an emergency landing strip for aircraft?
No. See http://www.tfhrc.gov/pubrds/mayjun00/onemileinfive.htm (official) and http://www.snopes.com/autos/law/airstrip.asp . It was considered briefly ( http://www.fhwa.dot.gov/infrastructure/turner.htm ) but never adopted officially. There are unusually-built overpasses (truss structure) on a straight section of I-75 near the former Kincheloe Air Force Base (now Chippewa County International Airport) in the Upper Peninsula of Michigan, leading to speculation that the Michigan State Highway Department did build I-75 here to accomodate aircraft. This is purely speculation, however, with no conclusive proof so far. Conversely, there was a Cold-War bunker built under I-5 in Seattle, at the Ravenna Boulevard overpass, by the state of Washington in the early 1960s (see http://www.historylink.org/output.CFM?file_ID=3705 ). Nov 6, 2003 6.7 Q: What is PrePass? A: PrePass is a system in which truck drivers may use a transponder to bypass weigh stations. For more information go to http://www.pre
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