METRO Route #4 travels between Portland and Westbrook, via USM (Portland) and Brighton Avenue, with service to IDEXX, Abbott Labs (NEW), the Hamlet, and Westbrook Hub (connect to Route 3 and Husky Line).
June 6, 2022: Some bus stops were temporarily moved due to construction.
Route 4 Schedule Changes Effective August 28, 2022 -- HERE Route 4- Service returns to Mechanic Street bus stops (Westbrook Hub) when construction is complete. Schedule updates. including the continuation of Route 4 to Route 5 on some Sunday trips. Route 4 Brochure - HERE