N Scale Mast-Arm Traffic Lights - Just Plug(R)Details: The Mast Arm Traffic Lights hang over part of the intersection and are used for intersections located on suburban or small town roads. They are ready to place right out of the package. They're hand painted and authentically weathered. The Traffic Lights are pre wired and made for use with the Just Plug Lighting System. Single faced and includes two red lights and two green lights, enough for one 4 way intersection.