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I have this feature on my ActiveHybrid3. There was a promo from BMW when I ordered my car, 8TH was a $0 option. I didn't plan on buying it, but now I consider it a must have feature.
Like others have mentioned, it displays the posted speed limit in a white square (looks like a speed limit sigh) in your HUD, to the left of your actual speed. I never have to pay attention to the posted signs, because the camera always sees them for me. Just like anyone else, it's still up up to the driver to obey/disobey, but this just takes all the guess-work out of it.
It is correct about 98% of the time. It can get confused if you are traveling on a side road of a highway, and it inadvertently picks up the sign from the major (or minor) road, instead. It is usually very obvious when this happens!
I personally love it, and plan to order my next car with it. Along with HUD, of course.
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