Make sure your truck tractor meets the NHTSA 393.11 requirement of reflective device in the location specified by FMVSS number 108 including the conspicuity treatments. This angled aluminum mud flap strip with reflective 6 inches DOT-C2 conspicuity tape attaches onto the angled mud flap hanger and sits on top of the mud flap. It is designed to meet the FMCSA's conspicuity requirement.