Cars are not funny. Speeding cars are not funny. It is not funny when a car spins around and speeds in the other direction. It is not funny when a car flies through the air. It is not funny when a truck crashes into a car.
The third Cannonball Run film is a mind-numbingly abysmal, cheapo Canadian production starring John Candy and a bunch of C and D listers. Might make a good answer to a trivia question, but this little-known sequel is truly pathetic.