City Loop is an underground, four mile circuit railway around the central business district of Londinium, Forriedor. The area of Londinium inside of the City Loop is pedestrianized; no personal automobiles or non-transit commercial vehicles are allowed in this zone. The loop is named because of the rectangular shape that the subway loop follows, formed by Whitehall Avenue on the west, Halifax Street on the north, Forriedor Avenue on the east, and Park Boulevard on the south.