Old traffic signals are sometimes used in decorating a game room or boy's room. Aside from being interesting lighting fixtures, traffic signals can control outdoor games like "Red Light, Green Light" or serve as the starting signal for races.
Electricians can rewire used traffic signals to mimic working signals. Hardware stores or online suppliers such as TrafficLights.com provide simple control systems that can change the lights or make them flash. Connecting the signal to a simple power cord makes the lights hold steady.
Those looking to purchase used traffic signals can often find them on eBay, at swap meets or as rare finds in antique stores. Additionally, the contractors who provide and maintain traffic signals sometimes have used signals to dispose of.