I work as a motorcycle designer, and these things are absolutely horrible for performance and safety. Unsprung weight affects lighter vehicles like motorcycles far more than cars, and they don't work well on vehicles that lean over because they don't absorb shock laterally very well. Also, the gaps trap mud and gravel on dirtbikes and ATV/UTV's; they can really bog them down.

A link in the article lists the schools and their reasons for closure: https://www.bestcolleges.com/r...