Route 138 has a cloverleaf interchange with Route 93 in Canton near Great Blue Hill. From Canton, it goes north into Milton, then enters Boston in the Mattapan section. South of Canton, it travels to Stoughton, continuing into Rhode Island, through Newport and ending in southwestern RI.
route 138 has a cloverleaf interchange with route 93 in canton near great blue hill from canton it goes north into milton then enters boston in the mattapan section south of canton it travels to stoughton continuing into rhode island through newport and ending in southwestern ri