Originally Posted By: scoobie
It was 20F going down 69 HWY, snow squalls, shoulder covered, center partly bare. Various 4WD trucks, 4WD Hondas, 4WD FourRunner, etc, all in a chain, hogging the partly bare passing zone in the passing lane, only the regular lane on the right clear of traffic, because it has 6" of snow on it. Traffic going 35 mph.
I pointed the Subaru Impreza, 2008 wagon, with electronic stability control and 4 speed automatic, with the 205/55R16 Dunlop M3, 7/32" tread on front, 5/32" tread on rear, on their third season, I pointed it to the regular snow covered lane, on the right, slightly openened the throttle, and without ANY complaint from the vehicle, NO slipping, it went to 45mph, and I easily passed 10 vehicles, passing on the right. With just three more vehicles ahead, we were back on the regular 2-lane part of the highway. I waited a bit, then throttled it to pass. The vehicle encountered various ridges of snow, piled up from the traffic, but DID NOT COMPLAIN or skid at all. It easily took off, just like it was on dry pavement, and passed everyone in a jiffy. Soon we were up to another 4WD truck. Despite falling snow, mainly snow covered road, passing it was a breeze. The car easily moved from partly bare, to snow covered, across ridges of snow; after another hour we were further south, and we were driving on slush, the car was cruising at 70mph with no hint of hydroplaning, on slush.
Never had a more beautiful car. I love my Subaru. Thank you Dunlop for the M3 tires. Even though they are worn down 50%, they make driving on snow feel like dry pavement. Once it had a slight sideways slip of the back end - it almost instantly went back to a perfect straight line. What was usually white knuckle driving, was a pleasant and relaxed experience, as it blew away all traffic IN REAL WORLD NORTHERN ONTARIO lake effect snow conditions. All other North American, European, and Asian were far behind. No wonder Detroit is going bankrupt. They need to hire a few Japanese engineers.
I wouldn't make a big habit of passing folks like that with half worn snow tires, the little tail wag was a warning...
Next time go into the unused lane when no one is around and try touching the brakes or give the steering wheel a little wiggle. You'll find that your tires aren't really cutting through all the snow, you are kind of planing on the snow but the snow tires still give some grip that all seasons don't. Not a lot of grip though and its easy to overwhelm that bit of grip as the tires at that speed don't really care which way they are pointed...
My tracker 4x4 has nearly new 205/75R15 snow tires with 16/32" tread depth and I can still feel in loose firm contact when plowing through deep snow at 40-50mph. The next set of snow will be as narrow as possible even sacrificing some ground clearance.
To be honest for that kind of driving my old 95 Neon is better, 155/80R13 snow tires cut through to something firm better at speed and it always understeers when hitting the gas, 4x4 and AWD still put power to the rear axle which can give you the little tail wag you had.
All I'm saying is be semi-careful, all the electonic AWD stability control mumbo jumbo can't help if your tires riding on top of 3 inches of loose snow or slush.
Ian