Design by Rian Rahardi ( The most common traffic lights consist of a set of three lights: red, amber, and green. When illuminated, the red light indicates for vehicles facing the light to stop; the amber indicates caution, either because lights are about to turn green or because lights are about to turn red (depending on the region of the world you are in); and the green light to proceed, (if it is safe to do so). There are some variations in the use and legislation of traffic lights, depending on the customs of a country and the special needs of a particular intersection. There may, for example, be special lights for pedestrians, bicycles, buses, trams, etc. and there may be special rules or sets of lights for traffic turning in a particular direction. Complex intersections may use any combination of these. [wikipedia]