Currently, speed camera voice alerts only sound if you are exceeding the speed limit. It should be possible to configure an optional setting where the speed camera alert always sounds, regardless of whether you are above or below the speed limit. This is because you might be driving below the speed limit just before passing the camera, so the alert doesn’t sound, and you’re unaware of its presence. If you then accelerate and pass the camera, you could exceed the speed limit. For this reason, I believe there should be an option to always enable the alert.