Yesterday I was able to put the deep-snow driving dynamics of my Model S to an extreme test. This was not voluntary. I had flown to Manchester NH on Tuesday night and spent the day at Hanover, NH. I was scheduled to fly back last night, but with the serious storms hitting the Northeast, all flights were canceled and I ended up have to take a train from Boston to get home. My car was parked indoors at the BWI lot; I arrived for the 25 mile drive home at about 1:45am. At that point there were about 6" inches of snow on the ground and nearly all of the roads had not been cleared. So I set out with a bit of trepidation, not having driven the car in these kinds of conditions. The car performed flawlessly on the interstate and on back roads. About 20 miles were on interstates that had not yet been plowed or salted so I faced pretty raw conditions. I kept a steady speed of about 35-40 mph with no serious fishtailing or handling anomalies. Another 5 miles or so was on back roads with some steep inclines and snow piles about a foot deep. The car took the hills with aplomb and plowed right through the deeper parts, with just a bit of wheel spin so be sure, but nothing that created any major concerns. I couldn't have been more pleased with the car's performance in these very treacherous conditions.