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traffic jam When there is a traffic jam, it means that the movement of cars and trucks on a road has slowed down or stopped. Accidents, or just too many cars on the road, can cause a traffic jam.
traffic light A traffic light is a light that changes color to tell drivers when to stop or go. When the light is green, the cars can go. When the light is red, the cars have to stop. A traffic light is also called a "traffic signal."