Of these, the following are attributable to "static variables become dynamic" (and highly nonlinear at that...): - Your stopping distance can effectively chang

Of these, the following are attributable to "static variables become dynamic" (and highly nonlinear at that...): - Your stopping distance can effectively change every few feet - A foot of snow accumulation may be transferred from the roof of the car in front of you to the windshield of your car with little to no warning The following are hard planning problems: - Lane lines cease to be a thing, even if you can see them, you're better off not following them - Stoplights also mostly become a guideline, it's sometimes safer to run them than spin out But these are just damn hard and probably the true limiting factors: - Signage or signalling may or may not be visible at all - Other cars or pedestrians may or may not be visible at all even in daylight But I'm not an expert on perception so... maybe that's my bias showing.