I'm frankly a little tired of hearing that only "bad" drivers need ABS or TC, and I respectfully disagree.
I've been driving for almost 20 years, and with ABS/TC since 1996. I've only had one occasion that I can remember to turn off the TC, and that was glare ice on a hill.
Otherwise, I drive commensurate with the conditions, and hardly ever activate either system. When they do come on, it's because I've missed something, or the conditions changed, or whatever, but it's a clue that I need to slow down.
Of course, I didn't have either when I lived in Michigan's UP. Talk about snow. Maybe I'd see things differently if I had. But, C&D did a test several years back, comparing a 4wd, fwd, rwd, and fwd with TC, and rwd with tc in deep snow. They drove each one till it got stuck. The 4wd made it the farthest, followed by the fwd with TC, followed by everyone else.
ABS and TC do not replace driver skill, but I still think that when these tools are understood and used properly, they can and do enhance safety and control, even for "good" drivers. Your model assumes that the conditions are always known. Common sense and 32 years of driving ought to tell you that this is not always the case.
