Answer: usone

AnswerCrossword Clue
USONEMe.-to-Fla. route
USONELongest American north-south rte.
USONERte. from Maine to Florida
USONERte. with a terminus in Key West, Fla.
USONEMaine-to-Florida rte.
USONEIn Key West it's known as the Overseas Hwy.
USONEIt joins I-10 in Jacksonville and I-90 in Boston
USONEEastern seaboard rte.
USONERoute from Me. to Fla.
USONEAuto route from Me. to Fla.
USONEHighway to Fla.
USONEMaine-to-Fla. highway
USONELongest north-south highway in America
USONEHwy. paralleling I-95
USONEIt parallels I-95
USONEMe.-to-Fla. highway
USONERte. through six Eastern state capitals
USONEIts mile zero is in Key West, Fla.
USONEMuch of the Boston Post Rd., now
USONEIt passes through six E. state capitals
USONERoad from Fort Kent, Maine, to Key West, Fla.
USONERte. that parallels I-95
USONEEast Coast rte.