DOBPLAST reflective triangle DPT35 0035-0000 reflective warning triangle for vehicle identification The DOBPLAST DPT35 0035-0000 reflective triangle is a passive safety and visibility marking element in a triangular design for fixed mounting on trailers, cars, vans and commercial vehicles. The red reflective surface provides improved visibility in incident light and contributes to increased road safety. The reflector features E20 IIIA homologation for use in public road traffic.