Have a SHOVEL (telecopic one), use it to remove snow that prevents your moving.
There is a tool (go to Canadian Tire and ask them, and I found that in Costco also) that you can put them in front of your wheels (front wheel if your car is front wheel drive). You cannot (I doubt) get those back since your car is away (if you stop, trouble again??). The cost of that tool is around 30 Plus Tax.