The McGrath Highway southbound off-ramp to Somerville Avenue will be permanently closing to traffic beginning April 11.

MassDOT plans to permanently close the southbound Somerville Avenue off-ramp, while opening a a new at-grade, signalized northbound connection to the McGrath Highway at the Somerville Avenue and Medford Street intersection, according to a press release. Also, the tunnel under the McCarthy Overpass that connects Somerville Ave and Medford Street to Washington Street will be closed.

Traffic heading southbound on the McGrath Highway to Somerville Avenue will be rerouted to the Washington Street off-ramp to Medford Street. New traffic signals will be installed at the Somerville Avenue and Medford Street intersection for the on-ramp.

The work is part of a series of interim improvements being made to the McGrath Highway corridor intended to provide increased pedestrian and bicycle access at its Washington Street and Somerville Avenue intersections. Work is scheduled for completion this summer, according to the release