[kingsuper20]

My own guess is that the difficult-to-solve problems tend to be in surprising areas (as are the easy-to-solve).

People are so poor at driving on ice/snow that it seems like a much lower bar to clear.

[therouwboat]

I think people are pretty good at driving on snow, we have lots of snow every winter, but there is rarely any problems in traffic.

For self driving cars its very hard, roads might be a lot narrower and visibility is limited because of snow banks, also you need to know what part of the road you should drive, sometimes there can be deep grooves and you might get stuck. If you stop at traffic lights etc. it might be hard to get going and how does the computer know that this crossing is very slippery and it takes 3x more time to take off?