1. Take out the warning signs of the malfunctioning car from the packing box when in use, hold the bottom with your hand, and open the supports on both sides of the bottom respectively. Place the opened sign on the ground, pull up the left and right reflection sheets, and insert the pins on the left reflection sheet into the bottom of the opening groove of the right reflection sheet. 2. Place the open reflective surface of the faulty car warning sign towards the direction of the incoming vehicle behind the faulty car, at an angle of 5° to the left of the vertical surface of the signboard and the vertical surface of the rear of the car, and place the ordinary road 30-100 meters behind the faulty car The highway is placed 100 meters behind the faulty car. 3. When you stop using, retract the left and right reflectors and supporting feet in the reverse order of the aforementioned opening, and then put them in the packaging box. Pay attention to protect the red reflective surface and fluorescent surface when picking up the signs to avoid scratches. When connecting and disassembling the left and right reflectors, push in or pull out along the direction of the groove to avoid damaging the sign.