Federal law requires tractor trailers, flat beds, tankers etc. to have a 2" wide highly reflective tape on the sides and rear of each vehicle. Our red and white striped tape (11" red, 7" white) comes in 2" x 50 yd rolls and meets all federal and state specifications. Specification compliance: Reflectorization Requirements: ASTM D4956-93B Type V. NHTSA conspicuity regulation: LS300 C - FP92. Effective 12/1/93.