Why are countdown timers removed from traffic lights?
1 Answers
The removal of countdown timers and the adoption of flashing reminders are aimed at reducing instances of running red lights. Here is relevant information: Light colors: Initially, there were only red and green colors. Later, after improvements, a yellow light was added. The red light indicates stop, the yellow light indicates preparation, and the green light indicates go. The use of these three colors as traffic signals is related to human visual structure and psychological reactions. The human retina contains rod-shaped and three types of cone-shaped photoreceptor cells. Rod-shaped cells are particularly sensitive to yellow light, while the three types of cone cells are most sensitive to red, green, and blue light, respectively. Due to this visual structure, humans can most easily distinguish between red and green. Although yellow and blue are also easy to distinguish, because there are fewer photoreceptor cells sensitive to blue light in the eye, red and green are still the best choices for color distinction. Traffic signals: At intersections, red, yellow, and green traffic signals are hung on all sides, serving as silent "traffic police." Traffic lights are internationally unified traffic signals. The red light is a stop signal, and the green light is a go signal. At intersections, vehicles from several directions converge here, some going straight and some turning. Determining who goes first is guided by the traffic lights. When the red light is on, going straight or turning left is prohibited, but right turns are allowed if they do not hinder pedestrians or other vehicles. When the green light is on, vehicles are permitted to go straight or turn. When the yellow light is on, vehicles should stop at the intersection stop line or within the pedestrian crossing line, but those already in motion may continue. When the yellow light flashes, it serves as a warning for vehicles to pay attention to safety.
