The shopping cart is a soapbox derby racer. It is
gravity powered and has been in numerous races. It
was originally build for the Sand Hill Challenge, a
venture capitalist funded race in Silicon Valley. I
built it with a group of friends for mySimon.com . It
has working head and tail lights plus a horn which
plays Dixie hidden in the airscoop. The wheelchair
hubs were all from Phil Wood, the rear having disc
brakes. After the company moved I inherited the racer
and have since made quite a few modifications and have
raced a few times down Bernal Heights in San Francisco
at the SF Illegal Soapbox Society.