Woodland Scenics HO 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 HO 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.