Why do I-17s exit numbers start so high?
Until the mid-1980s Arizona used a special system for its mileage — any route which did not enter Arizona from another state used the mileage of the route where its southern or western end was for its point of origin rather than zero (e.g.: If Route 2’s southern end was at Route 1 and Route 1’s mileage at the Route 1/Route 2 intersection is Mile 57, then Route 2’s lowest-numbered milemarker would be Mile 57). I-17 is a special case: Its exit numbers are actually those of the former longer routing of AZ 69, which branched from US 89 at Mile 201, since I-17 and AZ 69 were paired early on. AZ 69 has been truncated since I-17’s exits were numbered (see http://www.arizonaroads.com/arizona/az69.htm ). I-17’s exit numbers are not related to those of I-19 (see 10.3). Feb 20, 2002 6.3.15 Q: What’s with the I-465 spur northwest of Indianapolis? What is it designated? A: I-865, the east-west I-465 spur which connects I-65 to I-465 northwest of Indianapolis, exists partly because the I-65/I-465 i
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- Why do I-17s exit numbers start so high?
