 The highway meets the western end of MD 372 (Wilkens Avenue) and passes between Rolling Road Golf Course on the east and the Catonsville Campus of the Community College of Baltimore County to the west.MD 166 temporarily expands to four lanes between Valley Road and Bloomsbury Avenue, between which the highway passes Catonsville High School.The highway narrows and passes along the edge of the Central Catonsville and Summit Park Historic District before veering north at Hilton Avenue and reaching its northern terminus at MD 144 (Frederick Road) west of downtown Catonsville.