Re: figuring out
I worked at a site which used the guy on the desk with an unlock button approach for a while. 6 stolen exec saloons later a card reader was installed. Most of us drove a variety of older fords, vauxhalls etc and the security guards could not really be expected to know everyone so any car was let in to the car park. When the 'exec' then turned up in the top of the range merc /audi/bmw the security guard would hit the gate release. Unfortunately some local scallywags had taken to stealing local ford and vauxhalls driving in tot he car park and then parking up the stolen rust bucked and treating themselves to a 'free upgrade'.
This problem disappeared completely once a swipe in swipe out system was installed.