For all but its final 0.4 miles (0.64 km), the route lies within Plymouth County.

Along the way it intersect several major highways including Interstate 495 (I-495) in Wareham and U.S. Route 44 (US 44) in Carver.

[2][3] The route follows the town line for approximately a tenth of a mile before being wholly in Wareham.

It then crosses I-495 before clipping the corner of Middleborough and re-entering Wareham for a short while before finally entering Carver.

In Abington, instead of heading straight at the intersection with Route 123, the route went right, running concurrent along Centre Avenue until Spring Street where it turned left and crossed into Weymouth on Union Street.