- limited visibility due to haze or precipitation - everything is some shade of white/grey/brown - snow is incredibly reflective - winter is cold; sensors ar

- limited visibility due to haze or precipitation - everything is some shade of white/grey/brown - snow is incredibly reflective - winter is cold; sensors are almost certainly affected, dirty, or covered - pedestrians are bundled up, looking less like people - road markings are obscured or buried - signs are dirty - stopping distances are increased - speeds must be slower to compensate for lack of traction - "traction control" only helps when accelerating; stability control and ABS only help so much in snow/ice