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It seems like it used to be talked about more frequently when I first began driving this car in 2019, not so much lately. But you're right, the i3's ACC is strictly camera based, no radar, and as such has some problems with direct sunlight, dirty or speckled glass, or other challenging lighting conditions. One that regularly throws my car off at night is coming over a short hump of a freeway overpass and the camera gets an eyeful of a brightly lighted overhead signboard. If there's not another car in front of me for the system to reference, the signboard must confuse the heck out of it because it reliably kicks off every time. But yeah, low sun is the worst.