The dataset lists 64 causes for close to 14,000 fines being scrapped by Oxfordshire County Council.
Two PCNs were cancelled as the vehicle owner was in prison, and one as it was a diplomatic vehicle.
Ambulances had 36 fines revoked, the police had 16, two for the fire service, four due to the driver being a doctor on call, along with more than 1,000 for taxis, and more than 4,000 vehicles without a registered keeper.
Disabled drivers, people with medical reasons, untraceable and foreign vehicle owners received cancellations.
More than 5,000 PCNs were voided for a range of permit errors and for motorists who had paid for entry.
