Rather than speeding cars, raceways in the A&D world carry speeding data and electricity from one connection point to another via cables and wires. Raceways can be closed or open, plastic or metal, stiff or flexible. They can house cabling along the ground, down/up a wall, along a ceiling line, or even within furniture. If wide, open at the top and located inside a plenum, a raceway might alternatively be referred to as a cable tray. Another term for a wall- or furniture-mounted raceway that is open at the top is J-channel due to the shape of its profile.