Route 154 becomes known as Saybrook Road before becoming concurrent with Route 82. It passes near the Haddam Meadows State Park as it once again becomes known as the Middlesex Turnpike. It intersects Route 81 as it becomes known as Saybrook Road again. Route 154 travels closely parallel to Route 9 near its north end. At the exit 10 interchange of Route 9, Route 154 continues as the Route 9 northbound onramp for its last , until it ends at the merge with northbound Route 9.