Just found THIS online,

 

 

would be worth getting it in mainstream VAG cars ahead of the competition.   :yes:

Very nice, but I wonder how effective it is when confronted with non-trivial, variable queue depths and traffic latency at lights.

the town I once lived in in Germany had a "green wave" on the ring road - if the traffic kept to steady pace (i think it was 60kph) then you would always get green lights