We can always rely on NS for a daft analogy. Cars don't normally drive on the pavement.
I would have gone with pushbike myself, I think it's a better analogy.
Too slow - about comparable with a pushbike
Not visible enough - about comparable with a pushbike
No lights - most pushbikes don't come with lights.
Seems like a perfectly serviceable solution to the sort of traffic problems that plague inner city areas at the moment. Smaller, lighter, quieter transport which makes a more efficient use of fossil fuels... There are already rules for the use of small personal transport vehicles which could apply with only minor amendments.
O.