I feel the time as come when it should be a criminal offence to take any priority space and then not offer this to someone for whom that priority has been made.
We find this with wheelchair spaces on Buses and Trains.
This should also be the case where disability parking spaces are misused.
While the majority of the population respect disability and priority spaces there is the consistent minority and it is this minority that needs to face criminal charges.
It is not down to signage, but the ignorant minority, who will even, on occasions defy when it is pointed out to them.
If they wish to act this way then they will only have themselves to blame when they incur a criminal record.