a system for providing internally illuminated traffic lane delineators is disclosed . this system includes a delineator device adapted for use with a traffic lane marking film comprising a flexible and pliable polymeric material exhibiting cold flow and reduced elasticity such as unvulcanized rubber . such a film conforms into intimate contact with a road surface under the influence of road traffic and stays in that deformed state . an array of electrical conductors is embedded within and extends the length of the film . the delineator device includes an electric lamp , a housing enclosing the lamp and a flexible sheet - like body comprising a polymeric material similar to that included in the film . a plurality of such devices may be readily affixed at any desired location along the length of the film by soldering leads from the electric lights to the conductors in the film and by adhering the sheetlike body to the film surface .