Deflecto Roadside Emergency Reflective Safety Arrow, Magnetic and Mountable, 18" (SA-2034C) Highly reflective, ultra bright emergency arrow helps avoid a potential accident or injury in case of roadside emergency Super strong magnets enable to quickly, safely and easily adhere the safety arrow to any car, SUV, truck or semi truck Can be adhered to the back of any vehicle and pointed right or left to inform approaching traffic of your position during the day or at night The emergency arrow folds easily for simple storage in the trunk Essential car accessory while changing a flat tire, waiting for roadside emergency assitance or any other hazard situation. Meets federal safety requirements for retro reflectivity and fluorescence, federal motor vehicle standard # 125. U.S. Patent No. 7,370,602