[ofrzeta]

What do you mean by miniature? I guess you need to have a certain physical size to make a snow plow work. Maybe the size of a lawn mower. Instead of starting from scratch you could get one of the robotic lawn mowers and try to modify it to plow snow on your street.

I think it will be hard enough to get it to navigate freely instead of relying on cables in the ground, which is what the lawn mowers use as boundaries of their world, as far as I know.

Here are some formulas to get started calculating the snow resistance force and the required vehicle weight :)

http://onlinepubs.trb.org/Onlinepubs/sr/sr185/185-038.pdf