First, I live in Quebec City, Canada. We have lot's of snow and I'm quite used to extreme winter driving.
I just went driving in the middle of a snowstorm. Bad conditions but nothing impossible. To my big surprise, I got stuck in the middle of the hill. Car was barely moving. I also tried another road, same thing. Traction control was too slow and confused. For your reference, an Honda Civic went thru the same roads slowly but surely. And, yes of course, I had winter tires... (but non studded as they're forbidden in my parking garage)
What's weird is that I went to the same hill last year with my Tesla Roadster - in the same conditions - and was able to climb without issues. So I wrongly expected the Model S to be performing in a similar way (even tough the Roadster had more weight on the rear wheels)
I'm really sad to say this, but the Model S in its current version IS NOT suitable for places with heavy snow and hills. On normal road it's okay, but as soon as you have some inclination, you're dead stuck. I was lucky not to be in traffic - that would have been awful.
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