Racers compete in an illegal motor rally competition, Speed Zone, which takes over the USA. Follow-on from Canonball 1 and 2.
With Burt Reynolds and Dean Martin nowhere in sight, this re-tread of the old coast-to-coast contest has to make do with cheap and none too scenic Canadian minor roads and a distinctly Formula Three cast.
John Candy is patently unfunny as the fattest competitor, Donna Dixon is pitiful as the Marilyn Monroe impersonation who sits beside him, Lee Van Cleef must have expired immediately after doing his bit part with a fishing rod and Brooke Shield's career at this point seems to have been similarly afflicted given her tiny embarrassing role as an air stewardess.
No laughs, no excitement, and really, no race