A bus lane camera as generated almost £1 million in fines in six months.
The camera, on New Street in West Bromwich, was introduced by Sandwell Council in December.
It has since issued 48,755 penalty charges to drivers caught using the lane.
According to a report by the BBC, the RAC described the volume of fines as a "significant worry", suggesting the camera is already one of England's most lucrative.
Spokesperson Pete Williams said: "I think alarm bells have to ring when you start getting such a high volume of fines.
"Most motorists do not set out to break the law."
The camera has raised £944,832, amounting to 270 penalties a day, or one every six minutes.
Sandwell's cabinet member for highways and environment, David Hosell, said:
"Any money that is made from the camera is put into highways projects and safety schemes.