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      01-19-2013, 07:53 PM   #4

Drives: 2008 M3 Coupe
Join Date: Aug 2012
Location: NC

Posts: 91
iTrader: (0)

I believe it relies on a sensor that is required to detect oncoming traffic/light. I had this feature in my 335i. I worked pretty well but I noticed a lot of new street lights didn't register with whatever sensor they use so it would activate them on some very well lit streets.