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On dry pavement in good conditions there is no reason you can't do 100mph. If its slick out or rainy, there is no way in hell you should be going fast. Slow down. 4wd helps you accelerate but you still can't stop any faster.
It still depends on the traction available. With ice/snow/water on the roads, the coefficient of friction decreases. As soon as you lock up a tire it goes close to 0 and you will not stop.
that's true.. but in 4wd (not AWD by the way) your engine braking goes to all four tires and increases your traction allowing for easier stops without locking up the tires. In 2wd, all the engine braking goes to the rear and has a tendency to lock that up. It works a lot better than using the brakes too, because it's less of sudden change at the tires so they don't lock up as easily.
you have to be aware of situations where you need to slow down ahead of time and not go too fast for the situation to begin with. Regardless it will still stop you faster than barreling on the brakes and sliding out of control.
I don't drive that fast at all. I went from a 99 Explorer to the 2000 Expedition and was trying to see if it was speed limited as low as the Explorer was. No excuses, but I was on the interstate away from town, no other traffic, so it was basically my own life I was risking unless you count the trees on the side of the highway.
I went to the speedometer stop needle in mine, looked like it was about 105, but i'm not sure if there is something wrong since I thought they were governed at 100. Mine never shutoff, I didn't want to risk breaking the speedometer.