Liability. The first time I was knocked unconscious was from treating real life go karting like Mario Kart. I'm guessing you want items which could really only have the effect of locking a Kart down for a period of time, that's some whiplash right there unless it comes to a gradual stop which is hard to do.
Nintendo actually did to AR Mario Kart with RC cars for a Switch add on toy thing, don't think it sold the best but it looks cool as hell
If it's easy enough that they can do it on limited run of toys, why not just slap the tech a set of real go karts?
Liability. The first time I was knocked unconscious was from treating real life go karting like Mario Kart. I'm guessing you want items which could really only have the effect of locking a Kart down for a period of time, that's some whiplash right there unless it comes to a gradual stop which is hard to do.
I want real F Zero racing instead.