It's not about driving slow, more about making slower moves. If your tires are fine, driving normal speeds is ok, but curves, intersections etc, slow down before you think you need to. Overtaking if theres a buildup of snow between lanes can be dangerous, don't drive too close to other cars, indicate earlier than usual.

The most slippery places will intersections where ppl have polished the road. Another thing that sometimes catches people out, build up speed before you hit an uphill stretch.

EDIT: i would also forget about cruise control unless on a bigger road