For either the fishermen or the golfers to have changed their habits would have been an infraction of their self-imposed discipline which would have shocked all right-thinking and regularized citizens.
There are no more uses of "infraction" in the book.
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an infraction like a speeding ticket
A photo is taken of the car in the intersection with the red light. The violator can see the infraction photo online and determine if they want to challenge the citation.