People in Canterbury are secretly putting surveillance cameras on their properties to try and help police catch boy racers.
It comes as boy racer activity continues to be a problem, particularly in the Selwyn District.
Senior Sergeant Anna Lloyd said increasing numbers of residents were putting up surveillance cameras outside of their homes to capture night-time footage of burnouts.
Police were then using the footage to identify and then take action against specific drivers.
"If it assists us in identifying some of these vehicles that are doing burnouts we can use that later on to go and impound the vehicle," Lloyd said.