Via: http://gowjobs.blogspot.com/2010/03/illegal-soapbox-racing-turns-out-its.html
the County of Los Angeles has put a code into place forbidding the use of non-powered vehicles on county roads with a grade of more than 3%, including skateboards, street luges and our "box-car coasters"
So.Cal Illegal Soapbox Racers race the 3rd sunday of every month. Our gravity powered racers are fast, fun and not expensive to build or race!
Basically your cart needs four tires, brakes on two wheels, no weight or ballast, no weapons, and must be gravity powered (no engines or drivetrain of any type). We require all drivers to wear a helmet, and strongly suggest gloves and other protective gear.
Two goups that have terrific naems and race downhill?
VULGR The Ventura Underground League of Gravity Racers
MISFITS Maryland Illegal Soapbox Federation & Incline Trials Society
See the Australian group AIGRF here: http://aigrf.blogspot.com/2009/08/race-21-hamptons.html
Skip the first 45 seconds