Solo2=autocross. Think the Stead airport events, with a couple at Lovelock and Hawthorne thrown in. Speeds are supposed to stick to 65ish or below for genuine street cars, and always do at Stead. Virtually no risk.
Solo1 is a name no longer used. Club Trials (or Track Trials, if I lost track of which name it is this year again) are higher speed autocrosses that can be on a racetrack, but aren't always. They are run very similarly to Solo 2, but speeds are higher and more safety precautions are taken.
In between are what we generally refer to as "track days." That's just a day where a club or group has rented the track and lets 3 or 4 groups of cars, sorted by experience, out for a period of time to hot lap. For beginners there is little or no passing allowed, and always with the permission of the passee.
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FWD is the new AWD
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