My wife and I were driving on the Skyline Drive in Virginia and I noticed something very interesting with TACC. The Skyline Drive is a relatively windy mountain top road with a speed limit of 35mph in the Shenandoah National Park. I set TACC to 40mph and as we went around sharp curves, the TACC would slow the car down to the proper speed to go around the curve just before it entered the turn (usually to 30-35mph). At first, I though it was a mistake with TACC, but it happened around every curve where 40mph would have been a little too fast. Has anyone else experienced this? Does anyone know if TACC has always done this? Does it use GPS to judge the proper speed for the upcoming curve? I'm just curious about it so any info would be great.