Well, one test being worth a thousand expert opinions, there is faster stopping if the tires aren't locked up and skidding. The best braking occurs with "Incipient Lockup". That's why ABS was developed. You can check with any engineering college's professor who teaches a course in Dynamics.
The homo sap 0.2-second time lag between the brain saying, "Do it," and the finger or foot beginning a motion means that if the first car in a common freeway "train" jams on the brakes, it is inevitable that #7 will hit #8. (From a study by the Society of Automotive Engineers, back in the 1960s.)
Getting away from snow/ice: The least liklihood of fender-bending is when you drive about six to eight percent faster than median traffic speed. Not "the fastest", but the median. There is a good reason for this. Highway traffic tends to run in clumps. If you run a bit faster, you're only dealing with one car at a time as you pass, with you making all decisions for action. Once past th clump, you're all alone--which is the safest condition. You have free space until you catch up with the next clump.
If you're running at the median speed, you're in a clump, relying on all those other people for constant correctness in decision-making. If you're running slower, you're relying on them to make correct decisions as they take action to pass you.
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