Q: why is the seat belt of General Motors called passive safety device, and how many different locking conditions are there for safety? Answer: all the safety belts on the car are called passive safety devices. Because the airbags and safety belts are all playing the role of protecting the driver after breaking the car, they can not take the initiative to protect them, so it is a passive safety device. The safety has four different locking States, namely overwinding locking, vehicle triggering locking, seat belt triggering locking and automatic locking. In what circumstances will the seat belt be locked down?