In reply to Choss Weasel:
It reads more to me as if they intend to use it to e.g. ban people who repeatedly vandalise public areas from being on them. In that context doesn't sound too bad. Perhaps a protection would be that a court order would need to be applied to the individual(s) concerned first?
As for travellers, I would be pleased to see anything that makes it less difficult to remove and prosecute them. If they came and went without leaving litter and causing damage I wouldn't mind, but this is invariably not the case.
Neil