The Solo2 Registration Card has many fields, and most of them are self explanatory. However, there are three fields which render your card and your entry invalid if you have not filled them all out. If you omit any of these items, you may not be allowed to run, or if you do make your runs, the score keeper may be unable to list you, so you won't be listed in the official results and won't receive points or trophies for that event. If you choose a number, you must be sure to choose a number which has not already been taken by another driver in your class.
Registration has a list of permanent car numbers and classes in use.
Your car number must be displayed visibly and legibly on your car. Although the rules allow male and female codrivers to run the same numbers, please be nice to the trailer workers and use different ones. If you don't know what class your car belongs in, Use this handy Car Classification web site . You may want to run in one of the SFR-Only classes, which are described in the SFR Solo2 Supplemental Regulations . If you are new to autocross, you should consider running in a Rookie Class .