What is it that you think makes handling snow and ice more difficult? Feedback control systems can respond an order of magnitude quicker to loss of traction/une

What is it that you think makes handling snow and ice more difficult? Feedback control systems can respond an order of magnitude quicker to loss of traction/unexpected behaviour than people can. Icy conditions are different, but not necessarily more complex than "ideal" road conditions. From the point of view of a driving control system it just requires a slightly different control law. Certainly there will be testing required, but I'd be surprised if it presents a major issue. Adverse conditions are one of the more obvious applications of driverless cars.