Ice Roads

The road we live on is unpaved, but it is so packed with ice you can't even tell what kind of road it is. It reminds me of that show about truckers in Alaska who drive on the ice. When I turned onto our street today I saw an SUV that had gone into the treeline where the road makes a T and a policeman parked next to it waiting for a tow truck. I'm not sure what is so hard to understand about not being able to drive on ice differently than when there is no ice?