So how does my car tell the difference between a passenger and several bags of shopping? It never asks the shopping to belt up but beeps like crazy at even the lightest passenger who delays.
Two of our cars have high central 'Tunnels' they save you having to fish around for a seat belt point between your hip and that tunnel and they comply with all present safety regs.
Well, mine are very lenient by the sounds of it and cope with the handbag complete with ipad, brolly and all manner of rubbish as well as a couple of bags of shopping.
How diplomatic it would be if it were to bleep a little more gently should it encounter a slightly lighter me after my week of salads!