Thinking about what you are saying about disabled drivers or passengers taking time to disembark, Nutty, reminded me of the problems we faced when the twins were small. Often we had to choose whether to leave them in the car while collecting a ticket or put them in the pram and take them with us. Given that it could take anything up to five minutes to open a buggy and organise two (not always cooperative) toddlers into their seats and strap them, in the new cameras could also pose problems for parents of young children. If I was in a strange area and the parking ticket machines were at a distance from the car I would not be happy to just leave them.