 Within Old Saybrook, the road turns northeast, and has an interchange with Route 154 northwest of Old Saybrook Center.On the east side of town, US 1 merges onto northbound I-95 and joins the route in a concurrency, as it widens to six lanes, and comes to a trumpet interchange with the southern terminus of Route 9, which heads northwest from I-95/US 1 as a four-lane freeway parallel to the Connecticut River, towards Greater Hartford.A short distance later, the two routes cross the Raymond E. Baldwin Bridge, that has a fourth southbound lane, over the Connecticut River.