Go to page 1009 the 3rd one down, it confirms what I said about the berm of snow in front of your tires with no abs.
http://www.accidentreconstruction.co...ynamicsABS.pdf
" The dependence of friction coefficient upon slip is very different from that of figure 1 for deformable surfaces. It is
thought that the poor ABS performance is because wheels that are sliding cause a ‘dam’ of gravel/ wet snow to build
up in front of the wheels, thus aiding braking. ABS is designed to prevent sliding "
Also from car and driver
" On any deformable surface-gravel, snow, sand-the best way to stop a vehicle is to lock up the wheels, a tactic that will always outperform the pulsing of anti-lock brakes. Doing so, however, eliminates the ability to steer while braking, which is not so good if there's an obstacle looming ahead."
http://www.caranddriver.com/features...nd-sand-page-2