In reply to scaredandweak:
I did click through to the link and, whilst I understand the concern, it's worth a watch before folk jump to the wrong conclusions. Firstly, it's nothing to do with mountain bikes or new trails, the video is of someone riding a trials motorbike. Secondly, I couldn't see anything he rode over larger than about knee high so exactly prime Font problems.
I have no idea on local rules banning trials bikes, so won't comment on that aspect!