Abstract: An assembly and method for spraying material on a traffic barrier. At least one vehicle is provided that travels along the length of the traffic barrier while contacting the traffic barrier and being guided by the traffic barrier. With each vehicle is one or more spray head arrays that spray the surfaces of the traffic barrier as the vehicle rolls along the traffic barrier. The spray heads can spray either cleaning material or coating materials. Both cleaning and coating can be preformed by spray head arrays in the same vehicle or in different vehicles. The spray heads can be automatically adjusted to match variations encountered in the traffic barrier as the spray head arrays are moved along the traffic barrier. In this manner, the quality of the application of sprayed material remains constant despite changes in the shape and/or condition of the traffic barrier being sprayed.