are you refering to these f*ing mini motorbikes by any chance
they should be bloody banned , the majority of the twerps " cant say the similar word i want to use here " that ride around on them are more than likely uninsured , untaxed or even dont hold a licence to drive a motor cycle
i have no doubt if one hits your car you will find your self claiming on your own insurance and loosing your no claims and god help anyone who isnt fully comp it will have to coem out of your own pocket
offenders should have them confiscated and crushed
naturaly if one finds its self weged under your car with teh rider it will be the person who is driving the car at fault
mind you what can we expect in a town where you can get away with almost any traffic offence because its too much hard work to enforce the law