A couple of weeks ago we drove from Dover to Birmingham which crosses two map zones. Around the M25 started to get intelligent road signs saying 75 min delay on M40 around Oxford. Oxford is on the UK Central map. No warnings from tomtom. The delay then went to 90 mins with still no notification from tomtom.
Switched over to google maps who diverted us.
I guess tomtom alerts would have kicked in when I reached the UK Central map.
Poor integration which was not apparent pre v2