Answer:

beltway

AnswerCrossword Clue
BELTWAYCity circler
BELTWAYIt goes around D.C.
BELTWAYRoad around a city
BELTWAYTurnpike around downtown
BELTWAYEncircling road
BELTWAYWashington's I-495
BELTWAYBaltimore's I-695, e.g.
BELTWAYIt's around D.C.
BELTWAYWashington ring