Route 80 runs within 5 miles of many town squares- including Downtown New Haven.

Route 80 begins as a 4-lane principal arterial road in New Haven, continuing due east for almost its entire length.

It then enters Killingworth, where it passes Chatfield Hollow State Park and intersects with Route 81 at a traffic circle in the center of town.

1132, a historic open-spandrel arch bridge built by the Connecticut Highway Department in 1934.

From Fair Haven to North Branford center, State Highway 135 was created.

Old Highway 135 continued south from North Branford center along modern Route 139 to the Boston Post Road.