continually walk, stand, sit, push, pull, climb steps, balance, bend, kneel, crouch, reach, power-grasp, and turn objects; frequently hold and safely manipulate a variety of hand and electronic tools; and frequently drive buses short distances, and back-up buses using mirrors. Cleans interior and exterior of buses, trucks, and cars including sweeping, vacuuming, mopping floors, washing windows; cleaning interior and exterior walls, seats, ledges, dash boards, and ceilings in order to maintain a clean appearance and sanitary conditions.