The city of Frankfurt am Main is expanding the use of traffic cameras installed on buses to catch vehicles parked illegally and issue fines.

In Frankfurt am Main, buses equipped with cameras have been capturing images of illegally parked cars since February, allowing the city to issue fines to drivers who commit traffic violations.

Now the project, which the city sees as a success, is being expanded with even more buses set to get cameras installed.

The operation in Frankfurt had begun in February as a trial. Initially, cameras were installed on just 10 of the city's buses.

According to a report by Der Spiegel, since then at least 421 illegal parkers have been caught on camera, and issued a ticket.