Turning car off at stoplights

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I think this has been around for 20 years or so. My new car does it. I might buy the $60 wiring harness that turns it off by default. In the city it doesn't make much sense. 90% I'm stopping at stop signs so only stopped for a second or two before proceeding or moving forward. At stop lights where one might be stopped for a minute or two, it makes more sense.