Roller skates are clearly not a vehicle. Similarly, neither is a wheelchair. They are not reasonably separable form the person using them.
A bicycle actually goes on roads, follow rules and get a ticket for jumping a red light.
A bicycle actually goes on roads, follow rules and get a ticket for jumping a red light.
You can take roller skates off, get out of a wheelchair, and get off a bicycle.
Imagine you were wearing roller skates being pulled by a dog.
Imagine you were sitting in a chair, with a roller skate bound to each leg of the chair, rolling down a hill.
Imagine you were a flea in a roller skate rolling down a hill.
Imagine you were a dog in a wheelchair rolling down a hill.
Imagine you were a flea on a dog in a chair with roller skates on its legs rolling down a hill.
I don't think that's particularly clear and I think a non-negligible number of people would disagree