Traffic lights flat vector icon

art, color, control, danger, design, direction, electric, element, equipment, forbidden, green, icon, illustration, isolated, lamp, light, object, red, regulate, regulation, road, safety, semaphore, shiny, stop, stoplight, street, symbol, traffic, transportation, urban, vector, warning, yellow, background, black, electricity, flat, front, highway, sign, signal, white, graphic, set, glass, image, order, intersection, crossroads