When your car is stuck in mud or snow applying "rocking manoeuvre" could be very effective. You basically roll the car forwards until the tires slip, then roll back, then repeat (see video below to understand the idea). An electric car could take this technique to a whole new level. Switching between forward and backward can be done automatically in instant, so the car should be able to unstuck starting with very low initial movements. Also the momentum could be controlled precisely on each wheel in order to maximize rocking acceleration and amplitude.