The other day, I saw an e-bike ad on Youtube that boasts it can go 50mph.

At that speed, shouldn't it be classified as a motorcycle? 50mph is the slowest speed to be allowed on some highways. At that speed, you won't be wearing a bike helmet but a crash helmet and tough protective clothing.

If they are capable of going 50mph, should they be allowed on MUPs or bike lanes? Sure they can proceed slowly, who's going to do that?