There are two kinds of traffic lights, for motor vehicles to see the lights, usually refers to the red, yellow, green (green to blue green) three color lights composed to direct traffic signals.
When the green light is on, allow the vehicle to pass, when the yellow light is yellow, the vehicle that has crossed the stop line can continue to pass. For pedestrians to see is called crosswalk light, usually refers to the red, green (green for blue-green) Two color lights composed to direct traffic signals, red stop, Green Line.
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