I've got that on my car. The switch is useful for when you need your lights on during daylight hours, such as in a funeral procession. On my car, I can also turn the switch to disable the automatic feature. That way if I were parked on a street at night and didn't want my lights on, I could have it so.
I do like this feature, however my wife's car does not have it. Once you get used to it being there you never think about turning on or off your headlights. But then when you get into another car without it,,,,,,,
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