RPM-921-ARC-RW Red-White Road Pavement Marker Bidirectional. Price: $3.50. r921-AR-C-RW. Availability: In Stock. Item #: r921-AR-C-RW -. Road Pavement Marker 921-ARC-RW Or Road Reflector Red-White Bidirectional Are Mainly used on Roadways To Denote one-way traffic Lanes, white for traffic moving in right direction, and red for wrong way. Chat Now