I had Traffimaster on one of my cars, probably around 2000 on a Vectra. It didn’t have a map display and was fed by beacons. I can’t remember how it alerted the driver. It might have been just a warning light or brief message. It was very basic but at least you were one of a few users so the rat runs weren’t jammed up in minutes as happens now satnav is so widespread and sends everyone down the same alternative route.
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