A motorist caught speeding is believed to be responsible for stealing a speed camera to avoid prosecution.
Police were called after a member of the public noticed the door on the camera, situated near Longcot, Faringdon, Oxfordshire, was open.
Officers say the camera and flash - which will cost over £42,000 to replace - were stolen sometime between Thursday 1 July, and Sunday, 4 July.
Police said the driver would have had to stand on a car to reach the camera.
Pc Simon Jenkin told BBC News Online: "This is a very quiet area, with very little crime, so I'd describe this as a significant crime.
"Due to the height of the camera we suspect the thief would have had to stand on a car or pick-up in order to reach it.
"It's likely someone would have seen this and we'd appeal for any witnesses to come forward."