The Tire Rack SCCA ProSolo® combines the excitement of drag racing and the skill of Solo on side-by-side, mirror-image autocross courses. Lining up at the familiar “Christmas Tree” start, drivers compete heads-up in various classes by combining their fastest times from each course. After class competition is completed, all ProSolo events feature the top drivers from each class, competing head-to-head in a variety of single- elimination, handicapped Challenges. The Super Challenge determines the Top Eliminator for the event, the Ladies Challenge draws from the two Ladies classes, the Honda Tuner Challenge draws from the six "Street" classes, and the Bonus Challenge is for those who have not qualified for one of the other challenges.