Solo, also known as autocross, has been the grassroots of motorsports activities for more than 30 years. Competitors run one-at-a-time (hence the term "Solo"), against the clock, through a road course lined by traffic cones on a low hazard location, such as a parking lot or inactive airstrip. While speeds are usually no greater than those normally encountered in legal highway driving, the combination of concentration and car feedback creates an adrenaline pumping experience.

Over 1000 Regional and Divisional level Solo events are held across the country at the local shopping center, airport and stadium parking lots or where ever competitors can find a large amount of pavement or concrete to layout their courses. The sport attracts ordinary sports and sports-type cars used for daily transportation as well as heavily modified vehicles used for racing purposes only. A helmet is required for competitors, but loaner helmets are available.

Several National Solo Series offer top level competition from across the country. The ProSolo Series features two cars on a side-by-side drag-strip start, leading to separate mirror-image courses. National Tours, Divisional competition and the National Solo Championships, which attracts 1000+ drivers, round out competition levels for everyone.

There is a level of Solo Competition for EVERY PERSON and EVERY CAR!!! Whether you are a complete novice and drive a 4-door Ford Escort or a veteran racer in a Dodge Viper, the SCCA Solo rules classify the full range of imported and domestic sports cars, sedans and all-out racing cars. The various classes offer MANY chances for the complete novice and the experienced pro to take home a trophy for this Sunday afternoon sport. This fits in perfectly with the basic "fun" premise of the program.

Stock Category - Includes mass produced vehicles that are normally used for everyday transportation. Stock Category cars must compete in their showroom configuration with only minor modifications allowed such as aftermarket shocks, wheels (factory width, diameter and offset), and tires.* The Stock Category is broken down into nine classes: Super Stock, A-Stock, B-Stock, C-Stock, D-Stock, E-Stock, F-Stock, G-Stock, and H-Stock. Street Prepared Category - Any and all Stock Category vehicles are eligible for Street Prepared. You're also allowed to make specific modifications to the suspension, ignition, intake, and exhaust to further enhance the performance of the vehicle.* No internal engine modifications are allowed, but minor changes to the bodywork to accommodate larger wheels and tires are permitted.* Street Prepared is broken down into six classes: A-SP, B-SP, C-SP, D-SP, E-SP, and F-SP. Street Touring Category - Includes sedans (four seaters) with a maximum displacement of 3.1L, normally aspirated. This category is for the popular street cruisers and import drag racers with lowered suspensions, air filter systems, and wider wheels.* Street Touring is broken down into four classes: STS, STS2, STX, and STU. Street Modified Category - A combination of the Street Prepared and the Street Touring rules, plus extensive drivetrain and suspension modifications are allowed.* This class has been referred to as a "Street Prepared on Steroids" class, because it usually contains street legal cars that have been modified beyond Street Prepared rules. Street Modified is broken down into two classes: SM (four seat sedans) and SM2 (two seat sports cars). Prepared Category - Contains high performance, production based non-street-driven vehicles that usually have gutted interiors and full roll cages. Cars retain their original design, structure, and drive layout unless otherwise specified in the Solo2 Rules.* Prepared Category is broken down into six classes: A-Prepared, B-Prepared, C-Prepared, D-Prepared, E-Prepared, and F-Prepared. Modified Category - Heavily modified specifically for the purposes of competition.* You'll see excessively altered Prepared Category vehicles as well as formulas, single-seat open wheel Indycar-type specials, dune buggies, and kit cars. Modified Category is broken down into eight classes: A-Mod, B-Mod, C-Mod, D-Mod, E-Mod, F-Mod, FSAE, and F125.

* Please refer to the SCCA Solo Rulebook for specific details on allowed modifications in each category.

Got more questions about autocrossing? Read the "Frequently Asked Questions" page, or the Solo Novice Handbook

Course Worker Instructions & The Down/Out Pylon Rule Diagram (Yes, you have to WORK at an event if you plan to play)

The "unofficial" online SCCA Solo Rules for Stock, Street Prepared, and Street Touring Categories and the Street Modified Class (Provided by Jerry Mouton)

Here's an "unofficial" car modification/classification quick reference chart (Provided by Milwaukee Region SCCA)

Need help setting up your car or troubleshooting handling problems? Read our Car Setup and Troubleshooting Guide (Taken from the book "Performance Handling" by Don Alexander)

Learn about the effects of Camber, Caster and Toe from Radioactive Racing's Suspension Setup Page

Here's a few Track Tips that might be useful at the events.

Thinking about getting racing tires for your car? Read our Choosing Tire Sizes article before you make your purchase

Read Understanding the PAX Factors to learn how all the different cars' times are combined

To join in on the fun, check out the West Texas Region SCCA Solo Event Schedule