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When crossing an intersection, it's likely that large cars in front can block the view of small cars behind it, making them unable to see the traffic light, thus leading to potential traffic violations and security problems.
By using the two-sided traffic light, drivers can know whether to drive on or to stop by observing the signal shown on the back side of the traffic light for oncoming traffic when the view for a driver's signal is blocked.
ChongQing province, China