It should be popular in the USA, and other countries which have loads of traffic light controlled crossroads instead of roundabouts.

I spent 3 years in Edmonton in the mid-1960s, which was, and is, a place built on the grid system. As it had grown rapidly with large regular blocks, traffic light sequences were set so that driving at about the correct speed meant very little hold-ups in either direction. The new Audi idea is hardly a breakthrough, but clearly in an old street system like London's, it might have value.

The A4 through the industrial part of Slough used to be, and may still be, like this.

Not sure if there were signs saying to stick to the speed limit, but if you went through one light and stayed within the limit, you'd do the lot.

How exactly is this Audi gimmick supposed to work, is it receiving a signal from the lights, or is there some sort of GPS app which (a bit like satnav speed camera databases) knows the state of play of the traffic light's programming.

Is this system free for life, or is there an annual fee to join the club as it were.