There is a strip in the car with two black and white lines on it. What is this?

Stop warning bracket. There is a black and white strip in the trunk of the car, which is a warning bracket for parking. It plays a very important role. When vehicles on expressways and busy sections break down and stop in an emergency, it is necessary to park this bracket at the rear of the vehicle body150m to warn the vehicles coming from the rear and avoid them safely.