| 摘要 |
A card system and method for accessing a public transit system that employs a card pre-encoded with trip data permitting a set number of trips on the transit system and a card processing unit to receive and process a card each time access to the transit system is desired. The card processing unit includes a time write head to record the time of current use on the card and a time read head to retrieve the time of last use from the card. A microprocessor computes the difference between the time of current use and the time of last use. A trip read head scans the encoded trip data to determine the number of trips remaining on the card and a trip write head is provided to write to the card to decrement the number of trips by a given amount after use. The trip write head and the time write head are employed only if the difference between the time of current use and the time of last use is greater than a preset period. The card system automatically handles access to the transit system and transfers from one transit vehicle to another within the transit system thereby permitting faster vehicle loading, reduced fare evasion and increased driver concentration on vehicle operation.
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