When using the skin GjAk_v2.2_AriNe-28 there is a feature that you can add in sys.txt called skin_off_sound="speedcam_off"

skin_off_sound is misleading as it has nothing to do with turning off the sound. It makes a noise after you have (Passed) the speedcam rather than (Approach) the speedcam.
This is good so now you know that the speedcams are behind you and you are safe to go faster if you wish.

[speedcam_category:1]
activated_spoken_type=speech
activated_speech="Mobile Speed Camera"

approach_beep_distances=400 (CAM APPROACH)
approach_beep_spoken_type=speech
approach_beep_speech="Mobile Speed Camera"

skin_off_sound="speedcam_off" (CAM PASSED/BEHIND)

This function is only available if you are using the GjAk_v2.2_AriNe skin.

I would like to be able to use this feature without having to use the skin and I thought that it may be possible for someone to make this work with a UX routine.