The terms of the scheme do allow for large groups to be refused travel or even for an operator to take a route out of the scheme (in consultation with the LTA) if there is ASBYou won't be saying that if they decide to set fire to your bus, just like they set fire to fields, trees etc. I personally would amend this scheme to say 'free travel if you're with your parents or an adult who will fully take responsibility for your actions'.