Abstract: A double deck bus having an overall height of twelve feet six inches or less configured to provide the maximum number of passenger seats and wherein the passenger aisle of the lower deck is offset the passenger aisle of the upper deck. The aisle of the upper deck is a channel which depends generally downward from the floor of the upper deck which allows at least seventy-five inches of clearance between the bottom of the upper aisle and the bus roof. The aisle of the lower deck is positioned along one side of the bus such that the upper aisle and lower aisle are offset thereby providing the maximum amount of head room for passengers traversing either aisle. Approximately eighty passenger seats can be provided in the bus due to this orientation without exceeding the preferred height, width or length restrictions which makes the bus acceptable for commuter purposes in and round large cities with tunnel and bridge size restrictions.