A popular, annual event at Carnegie Mellon University, held during Spring Carnival, is the Buggy Sweepstakes. It’s a relay race, but instead of carrying a baton the participants push a highly engineered go-kart-like vehicle, which “freewheels” along a descending portion of the course.
Amateur Radio was added back in 1976 as a more efficient and safer way to control the race course, and this system of mine carries on to this day. An article I wrote about it was published in the April 1977 issue of 73 Magazine, reproduced here. (All issues of the magazine are now freely available on the internet.)