Quote from wikipedia
On high-traction surfaces such as bitumen, or concrete many (though
not all) ABS-equipped cars are able to attain braking
distances better (i.e. shorter) than those that would be
easily possible without the benefit of ABS. Even an alert, skilled
driver without ABS would find it difficult, even through the use of
techniques like threshold braking, to match or improve on the
performance of a typical driver with an ABS-equipped vehicle, in
realworld conditions. ABS reduces chances of crashing, and/or the
severity of impact. The recommended technique for non-expert
drivers in an ABS-equipped car, in a typical full-braking
emergency, is to press the brake pedal as firmly as possible and,
where appropriate, to steer around obstructions. In such
situations, ABS will significantly reduce the chances of a skid and
subsequent loss of control.