As the Solo season is kicking off in earnest, it seems like a good time to remind everyone that the Solo rulebook includes a rule regarding vehicle identification and to help out with a little refresher. 

The official Solo ruleset can always be found here: https://www.scca.com/pages/solo-cars-and-rules and Rule 3.7 begins on page 41.

3.7 Vehicle Identification

1. All vehicles must display numbers and class letters on both sides, which must be readable by Timing & Scoring, Course, and Grid workers at all times.
2. Only one set of numbers and class letters may be visible while the vehicle is running.
3. Class shall be represented by the upper-case abbreviated form rather than be spelled out. Ladies' classes shall be indicated by the letter "L" following the class letters. (Example: "BSPL" instead of "B Street Prepared Ladies.")
4. Numbers and class letters should be positioned next to each other. All letters and numbers must be on body panels, not on windows. All numbers and class letters must use the same typeface and the same color, and this color must provide adequate contrast to the background color (see Appendix F for examples).
5. Numbers must be a minimum of 8" (20.5cm) high with a 1 1/4" (3.25cm) stroke. Class letters must be a minimum of 4" (10.25cm) high with a 3/4" (2cm) stroke. In all cases, the height of the class letters must be between 25% and 75% of the height of the numbers. Stroke width must be at least 10% of the height (see Appendix F).
6. The "1" on two-two driver cars and the "L" on Ladies class cars are subject to all of the above requirements with regard to placement, color, size, and stroke.
7. Karts may use numbers and class letters of reduced size provided that the following conditions are met:
   1. Numbers must be displayed on the front and rear in addition to both sides.
   2. Class letters must be on both sides.
   3. In no case may the numbers be smaller than 6" (15.25cm) in height with 3/4" (2cm) stroke, using a high-contrast color and background.
8. For National Championship and National Tour competition, current official SCCA® required decals must be displayed on each side and front of the vehicle in a prominent location.

For National Championship and National Tour events, one (1) official SCCA®-approved National sponsor identification logo must be displayed in an upright position, in a prominent location on each side of the vehicle. Additional sponsor and/or event specific decals may also be required; refer to event supplemental regulations. Further information is contained in Appendix F.

National Solo Required Decals and Placement

Please click here for the currently required National Solo decals and approved placement. All required decals are available at tech.