What do the three green lights on the front of a large truck mean? ?

It is used to display the speed. When the truck is stationary, the three lights will not light up. When the truck is moving, the first light will light up, indicating that the brakes are on.

When the vehicle accelerates to a certain speed, the second light will turn on, indicating that the brakes can barely hold.

When all three lights are on, it means the brakes can no longer be applied.

So, why do you have to keep a considerable distance in front of the truck on the highway? That’s because you need to provide buffer space for emergency braking. Don’t think that you can overtake if there is such a large space in front of the truck. , the truck driver said that if there is no space in front and emergency braking is needed, the only way is: use your car as a buffer and "just let it go"

Attention drivers who like to overtake Please don't drive in front of a truck, especially when the front of the truck has three green lights.

If I remember correctly, it should be

The first light is on at 20~40 km/h

The second light is on at 40~60 km/h

The third light is on at 60km/h or above

A classmate was driving a large truck and hit the cross-harbour tunnel wall not long ago. This time I talked to him about the incident of Xu Weilun,

He said: In principle, truck drivers will not apply the emergency brake when encountering an emergency, because the truck body or container connected behind them can only be tied with iron chains. If the emergency brake is applied, it will not only cause folding ( That is, if the connection is broken), the car body or container behind will squeeze forward and hit the self in front, or cause a skid and roll, causing a large-scale serial car accident on the entire road.

So for them and To protect the safety of others, we have to choose the easiest way to control the vehicle, slow down as much as possible and directly chase the car in front of us. This is really... scary!!

Drivers must remember not to drive in front of a truck Don't drive in front of the truck, let alone in the middle of the truck, and don't temporarily overtake in front of the truck but slow down. Many car accidents occur because of this...especially the 1 or 2 small cars in front of the big truck. They will inevitably become scrap metal. Drivers must "driving safely". It's really too dangerous! Try to avoid it for safety, it's important to save your life!