Snow driving

* Much of the late-January 2014 chaos in Atlanta GA could have been prevented, had the authorities passed on a bit of snow-driving wisdom that I learned 65 years ago. To drive through snow up to about 3 inches deep, it helps to let some air out of the tires, enough to lower the axle about an inch.
* This improves traction substantially, probably because more tread touches the surface at any time, broadening the tire-road interaction and diminishing pressure-induced melting over the tire-road contact.