Route 154 is a state highway in Connecticut running for 28.24 miles (45.45 km). It serves as one of the main thoroughfares in the town of Old Saybrook, intersecting twice with U.S. Route 1. North of I-95, Route 154 runs parallel to Route 9, along to the west bank of the Connecticut River. The route ends in Middletown at Route 9.

U.S. Route 1 (US 1) in the U.S. state of Connecticut is a major east–west U.S. Route along Long Island Sound. It has been replaced by Interstate 95 (I-95) as a through route, which it closely parallels, and now primarily serves as a local business route. Despite its largely east–west orientation, it is part of a north–south route and is mostly signed north–south.