Terry Casey wrote:

I thought that none of the Gatsos were operational anymore,
due to the special film they use no longer being available?

No reason why the speed detector and flash gun portions can't
still be left running as a deterrent, of course!

The HADECS cameras don't use film, they're digital, but still have a
visible flash.

Not speed cameras, but I think a lot of the replacement red light
cameras here have changed from film+visible flash to digital+IR flash.