Are pitbikes allowed on road

Yeah they are if they are road legal ones like http://cgi.ebay.co.uk/Masai-DB125H-Road-Legal-Pit-Bike-Supermoto-J-S-SALE_W0QQitemZ140348059408QQcmdZViewItemQQptZUK_Motorcycles?hash=item20ad656f10&_trksid=p3286.c0.m14 that one is