From: ahk@chinet.com   
      
   John Levine  wrote:   
      
   >>We're talking about transit fares. All that has to be done in real   
   >>time is validate the fare media. The rest of it doesn't have to happen   
   >>immediately.   
      
   >Transit fares can be pretty complicated.   
      
   You gave an example in which you were billed in arrears. If you can   
   accept that the calculations can take place in the back office, then   
   the interaction with the passenger is pretty simple. Your credit card   
   is on file. This is no big deal.   
      
   The rest snipped 'cuz there's no good reason to do any of this   
   at the faregate.   
      
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