(Access from Main Street to the southbound on-ramp for Route 9 is designated as State Road 901).

Main Street is a two-lane road that goes north through Cromwell up to Rocky Hill for about 5.6 miles (9.0 km).

The Silas Deane Highway continues through Rocky Hill up to the town of Wethersfield.

It serves as the main thoroughfare of these two towns, also providing access to several shopping centers.

[1] The entire length of Route 99 is also known as the George Washington Memorial Highway.