We should ban all such perilous vehicles from the highways, and sling out any politician or councillor involved it letting them on the streets. Clearly they don't have the mental capacity for the job.
These things are bad enough when they are ridden obeying the law, but they are clearly more often used by those who think two riding at once is ok, red traffic lights don't apply to them, and they are permitted to pretend they are pedestrians if the pavement and/or a pedestrian crossing is available.
More coppers on the beat would help remove antisocial elements such as these.