At the first traffic light, you can only turn right when the right arrow is green, and you must turn right in the right-turn lane. Whether the arrow is red or green, you can't turn right in the straight.

There are two kinds of traffic lights. Motor vehicles are called motor vehicle lights. Usually, they refer to traffic lights composed of red, yellow and green (green is blue-green) to direct traffic.

When the green light is on, vehicles are allowed to pass, and when the yellow light flashes, vehicles that have crossed the stop line can continue to pass; Those who fail to pass should slow down to the stop line and stop and wait. When the red light is on, no vehicles are allowed to pass. For pedestrians, it is called crosswalk light, which usually refers to a signal light composed of red and green (green is blue-green) lights, which is used to direct traffic. The red light stops and the green light goes.

In fact, using these three colors as traffic signals is related to people's visual function structure and psychological reaction.

Our retina contains rod-shaped and cone-shaped photoreceptor cells. Rod cells are particularly sensitive to yellow light, while three cone cells are most sensitive to red light, green light and blue light, respectively. Because of this visual structure, people can easily distinguish between red and green. Although yellow and blue are easy to distinguish, red and green can distinguish colors better because there are fewer photosensitive cells in the eyeball that are sensitive to blue light. So what color is used for traffic lights is also asked by the university!

Colors also have active meanings. Indicates heat or intensity, the strongest is red, followed by yellow. Green has a colder and calmer meaning. So people often use red for danger, yellow for vigilance and green for safety.

Moreover, because red light has the strongest penetrating power, other colors of light are easy to be scattered, and it is not easy to see in foggy days, while red light is the least easy to be scattered, and it is easy to see even if the air visibility is low, and no accidents will occur. So we use red to indicate prohibition.

"Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China" Article 38 Motor vehicle traffic lights and non-motor vehicle traffic lights indicate:

(a) when the green light is on, vehicles are allowed to pass, but turning vehicles shall not hinder the passage of straight vehicles and pedestrians;

(two) when the yellow light is on, vehicles that have crossed the stop line can continue to pass;

(3) When the red light is on, vehicles are prohibited from passing. At intersections where there are no non-motor vehicle signal lights and crosswalk signal lights, non-motor vehicles and pedestrians should follow the signs of motor vehicle signal lights.

When the red light is on, vehicles turning right can pass, which does not hinder the passage of vehicles and pedestrians who have been released.