Product Overview Reflective material approved by SABS No Abnormal Cars Temporary road signs are also offered. High visibility is one of the key characteristics of the No Abnormal Vehicles road signs. In inclement weather and from a distance, these signs are intended to be easily observable by motorists. The reflective materials used in the design of many No Abnormal Vehicles road sign signs help them to be seen at night. Durability is another crucial aspect of No Abnormal Vehicles road sign signs. Temperature extremes, wind, and rain are just a few of the many natural elements that road signs must withstand. Therefore, the materials used to make them must be able to endure these circumstances and hold up over time.