 From there, traffic exits into Forest Hills next to Forest Hills Station.The entire roadway is signed as Massachusetts Route 203, which continues along the parkway as Morton Street.Named "Monsignor William J. Casey Overpass" in honor of a Depression-era priest of St. Thomas Aquinas Church in Jamaica Plain, the overpass was constructed in the mid-1950s to allow the increasing automobile traffic of the day to bypass the north-south traffic on Washington Street, South Street, and Hyde Park Avenue.