Woodland Scenics O Scale Just Plug Traffic Lights are ready to place right out of the package and come hand-painted and authentically weathered. The Traffic Lights are pre-wired and made for use with the Just Plug Lighting System. Whether at rural intersections or on busy city streets, they add interest to any scene. Check out the entire O Scale Just Plug line of lighting and accessories. Mast Arm Traffic Lights hang over part of the intersection and are used for intersections located on suburban or small-town roads. They are single-faced and the package includes two red and two green lights, enough for one four-way intersection.