TomTom NAVIGATION SYSTEM Reference Manual page 88

Traffic light camera - this type of camera checks for vehicles breaking
traffic rules at traffic lights.
Average speed check - these types of cameras measure your average
speed between two points. You are warned at the start and end of the
average speed check area.
While you are driving in an average speed check area, your average
speed is shown, instead of your current speed.
When you are in the speed check area, the visual warning continues to
be shown in the Driving View.
Danger zone - this type of warning is only given in France where you are
only warned about danger zones. Danger zones include all other types of
warnings.
When you first start using your device, no warning sounds are played for these types of cameras:
Accident black spot
Ungated railway crossing
Restricted road camera
Other camera
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