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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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