But under normal driving conditions, if you hear the ABS buzzing you need to back off of it and conserve your traction.
Sorry. I don't want to be the jerk guy that just can't let something go on the Internet. But this is special because it directly affects the safety of each one of us, and I really don't want to let something like that lie.
Do not believe that you can achieve better results than the ABS, whether that's by backing off and trying to stay right on the limit, or any other trick.
The fact of the matter is that under any circumstance other than deep snow, the ABS will do better than you. It will also do better than Michael Schumacher, Ryan Hunter-Reay, or Sebastian Loeb. The limiting factor for a human is that there's only one brake pedal, so you cannot control each wheel individually. Thus, you cannot keep all four
wheels at the limits of traction simultaneously. You're either going to have some at the limit and others locked and sliding, or you'll have none sliding, but not using all available traction. The ABS sensors watch each wheel individually, and modulate the pressure of each wheel individually, allowing each one to get closest to its greatest potential traction.
In Formula 1 racing, the cars have had ABS and traction control in the past. These technologies were all banned because they made the sport too boring: having the cars perform so perfectly took much of the interest out of the sport. Consider that F1 has said that ABS (and traction control) are, even for arguably the best twenty or so drivers in the world, an unfair advantage. No human, given the means of control we have, can do better than the ABS computer.
In 1997, the McLaren F1 team had a nifty idea. They added a 2nd brake pedal (where the clutch would have been in the old days), allowing the driver to send additional brake pressure to just one of the rear wheels. This innovation allowed the two McLaren drivers to lap the field. Once this innovation was discovered (by a photographer who stuck his camera down into a stopped car and quickly snapped a picture), it was quickly banned. If the addition of driver control of just one separate wheel was such a huge advantage, imagine what a difference separate control of each
wheel makes.Edit: typo