L
Lightning
Oh well, you were a little too slow to edit your post.Yes, the knob head wankers on them.
Go back a year or so ago and I was making similar comments in a cycling thread.
No matter what the device as long as they are easily acquired and so casually regulated it will attract those who intentionally or otherwise will use them in a way that they become a menace to other users of whatever common space they are being used in.
This has been an excellent discussion and I am particularly impressed with some of Tom's (@Amarillo) arguments for urban traffic restructuring. In that context I can certainly see a most useful application for the devices we are discussing.