Про абс на сыпучих поверхностях давно известно. Вот кстати выдержка их мануала мицу
"For road surfaces such as snow-covered roads and gravel roads, the braking distance for vehicles with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer to drive safely on such roads by lowering the vehicle speed and not being too overconfident"