The purpose of ABS has never been to reduce stopping distance, which is not to say it doesn't do so under most conditions. A very good driver without ABS can equal the stopping distance of ABS under the right conditions, maybe even improve on it, but overall ABS is going to give shorter stops.
Why? Two reasons: First, most drivers will lock up the brakes in a panic stop, and the static coefficient of friction between tires and pavement is much higher than the dynamic coefficient of friction. (That is to say, a sliding tire has less traction than a rolling tire.) Second, unless the vehicle's weight distribution is just right, the rear wheels will lock up sooner or later than the front wheels, which means you can't get maximum friction out of both front and rear brakes at the same time.
But stopping distance isn't the point. The real question is "are you safer with or without ABS?". A study done by NHTSA came to the conclusion "four-wheel ABS has essentially zero net effect on fatal crashes, but significantly reduces nonfatal crash involvements". So you're much less likely to be in an accident with ABS, although you're equally likely to die in an ABS versus non-ABS equipped vehicle.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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