RTI Satnav camera warnings

[F i F]

When the warnings pop up sometimes they have different coloured backgrounds.

I've only seen white and yellow-orange backgrounds so far.

I wondered if this was an indication of speed vs limit, but altering speed above/below limit doesn't seem to change things.

I also wondered if it was an indication of different type of camera, but again can't figure it out. For example drive along the ATM section of the M42 and the background colour seems to change without any obvious pattern to it.

Any Volvo dealers able to help? My local one isn't clued up on this.