Many self-driving car tests are conveniently run in warm, sunny climates where the road conditions are rarely less than ideal. But what about that significant chunk of the planet that gets snowfall? Yandex is finding out. The Russian internet giant has started testing its autonomous Prius cars in winter conditions around Moscow's suburbs to see how they fare when snow obscures the roads and ice makes traction difficult. The video you see here is highly edited, but it suggests that the driverless machines are up to the job -- they can stay in their lanes, come to smooth stops and brake for pedestrians.