PSM is like seat belts. They provide no benefit --well, unless you actually need them.
A few years ago, I did a 360 on I-95 going 70mph. A sudden shower made the road slick and the car (a Dodge InCrapped) did a full 360 within a matter seconds. I wasn't even changing lanes. It was pretty scary seeing headlights pointing at me rather than brake lights. Somehow I managed to not hit --or get hit. I was pretty lucky.
I have to wonder how the car would have performed if it had a "PSM" type system.
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