AMP: 0 Location: Putnam Ave and Byram Rd, Greenwich Welcome to Connecticut! U.S. 1 is the longest highway in Connecticut, both in length and in driving time. AMP: 0 Location: Putnam Ave and Byram Rd, Greenwich As we enter the Constitution State, we’ll come into Greenwich. AMP: 1 Location: Putnam Ave and Dearfield Dr, Greenwich … Continue reading U.S. Route 1, NY State Line to I-95