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Lol, sorry but your post is seriously misguided and you're conflating ABS with PTM modes. There's just so much wrong with your post I can't address it point by point, but here's a few things to consider:
1st, ice mode is to prevent application of the brakes from spinning the car if ONE SIDE of the car is on ice and the other is not, similarly front to back wheel speed differences. If one side of the car has far different grip levels vs the other, a full brake application WILL spin the car.
2nd, there's also an ABS safety feature that will limit braking in combination with steering angle to prevent spins, this is based on yaw. A combination of lateral g-forces + full brake application WILL spin the car.
3rd, ZL1 1LE cars don't have ice mode afaik, no idea about yaw.
4th, ice mode is programmed into every make of car and is well documented and acknowledged to be REAL by actual engineers that are responsible for brake system design.
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