Until Tuesday, the violations were automatically generated by a computer system that manages the toll system. Errors occurred when a Pikepass was misread and the computer could not match the photographed license plate number to an active Pikepass account.

Nearly half of all vehicles registered in Oklahoma have new plates and possibly new tag numbers since the state unveiled new license plates in January. This means Pikepass customers in good standing may be getting $25 violation notices because their account information does not match their new vehicle tag numbers, said Jack Damrill, spokesman for the Oklahoma Turnpike Authority.

In the past month, the Turnpike Authority has mailed 90,179 violation notices, about six times more than what the authority sends out in a typical month, Damrill said. The number includes motorists whose Pikepasses were not correctly scanned at a toll plaza and their license plate information is out of date. That number also includes people who traveled on the state's tollways without paying for their trip.