How will self-driving cars handle snow?

The roads in my subdivision are snow-covered, ice-rutted. The roads are slippery and treacherous. Many have not been salted or sanded and there is no sign a snow plow has been by. It is hard enough for a human driver to negotiate these roads, how will a self-driving car fare? I look at our winter roads and I am filled with concern. (This image is a download straight from my point-and-shoot. The scene is as black and white as pictured.)