Competition numbers must be displayed on all competition vehicles, as well as any permitted tow vehicles, in accordance with the NHRA Rulebook. Please see the 2026 NHRA Rulebook for the complete set of rules.

Section 21, General Regulation, Body: 7, 7:2 - Competition Numbers

Driver numbers and class designation letters must be displayed on both side windows and the windshield. Numbers on side windows must be a minimum 4 inches high and 1 1/2 inches wide. Class designation letters must be a minimum 3 inches high and 1 inch wide. Numbers and class designation on windshield must be a minimum of 3 inches high and 1 inch wide. Driver’s competition number and class designation must be displayed in a legible manner in a contrasting color to the vehicle’s background color, or light color on windows, in a prominent position, and be clearly visible to the tower personnel. Class and numbers must be in the form of permanent decals or paint. The use of shoe polish in any form is prohibited.

Section 21, General Regulations, Support Group: 9, 9:12 - Tow Vehicle

Any vehicle used as a tow vehicle must have the driver’s competition number displayed on the tow vehicle.