I work in the much hated MIS (data management dept) in a large college. It is 'interesting' to say the least.
Sanctions of driving would be driven (sorry) by complaints form the community. I doubt any school/college would actively seek out offenders, that would be costly and, frankly, idiotic. So, effectively, only those making really poor parking decisions would be penalised.
For example, a resident gets on their high horse and complains about a legally parked student car. The complaint gets passed to the student via their tutor and they then both know the precise whereabouts of one of the parking mavens... any sensible tutor/student would take steps to avoid that parking spot. At that point nothing would happen to the student, just a quick chat. Any sensible tutor would also consider a second complain in a new area to be a new misdemeanour, not an escalation, iyswim.
So it is a bit of a daft edict, but one that might give some students pause for thought and would go some way to appease the locals, who really do have to put up with a lot, I certainly would hate to live near my job!
As for VI formers sharing buses, buses hold say 3 students, VI forms hold about 300.... they wouldn't all fit once the school kids were on board. There MUST be extra buses run, even if they all have a mix of students on them.
I can only repeat that any Board will have debated this for a very long time. This may not be the first, second or third intervention. In fact I can almost guarantee that the Board will have had meetings, consultations etc with local residents and this will have been the last in quite a long line of 'solutions'. I could almost as certainly guarantee t won't be good enough or the last time it comes up.
It is partly a 'seeing to be doing' thing, to avoid any financial penalties and may also be part of a much bigger plan. One local VI form went through a similar process. It didn't stop complaints, so they used it to support their plans for a car park, with the council donating a plot of land.
Unless you are on the Board you will never know - such stuff being sensitive information and all 