I've heard that it's I-5 and it's also the only one I know of that might qualify. It's the freeway that runs from Vancouver, B.C. through Seattle, WA, Portland, OR, and south to the Mexican border. I can't think of any other highways on the west coast that meet the 1 in 5 mile requirement.
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0