I don't know how fast these Segway vehicles go but I would have thought it illegal to use them on a public highway. I've seen them in use in the large shopping malls, and I think they are a useful idea for staff to get around an indoor area quickly. Jimi Heselden was our local hero for his charitable works, he was the millionaire owner of the Segway. He died recently riding on one of those things, falling down a cliff on one. Makes you think of the safety aspect of them in open spaces.