Green police cars with flashing lights and flashing sirens have been introduced in Germany.
Some will be new models, others will be retrofitted to the model used in the 1980s, and still others will feature a red and black police badge.
Police in Berlin are not impressed.
Police spokesperson Christoph Schön said the vehicles are designed for a future where police are not needed to solve crimes.
“These vehicles are just a new idea,” he said.
“It’s not a replacement for the police, it’s not even a new police vehicle.”
But for the city of Berlin, the idea is controversial.
“I think they are trying to create a new form of police, and I don’t want to be associated with them,” said Markus Stöck, a retired policeman who helped organise the rally in the city.
The cars were also spotted in Paris, where President Francois Hollande said the new cars were “a response to the problem of crime”.
The demonstration in Berlin was not the first time the cars have been seen in Berlin.
In August 2016, a crowd of about 200 people gathered outside the city’s parliament in support of the car.
Police have not been allowed to use the new model for decades, but that did not stop demonstrators from using it during a demonstration against the car in January.