Not sure if it's the same for rego but I believe that for speeding fines if a vehicle is owned by the government then a larger than usual fine is sent to the government to pay. If they nominate the driver then the government fine is withdrawn and the driver is fined the usual amount. A friend was involved in one of these a few years back and if I recall correctly that was the situation.
Not sure if it's the same for vehicles owned by private companies.