I don't drive. I run into stuff often enough just walking. Being aware enough of thousands of pounds of steel projecting out from my body with tremendous forces and energy involved and lives on the line is just asking for trouble. It takes 110% of my focus to try to be safe, even then I make mistakes, and in the groggy trip to work and the exhausted trip back, I deffinately can't give that much. Interacting with drivers on the road in order to know where and when to go seems to me as social a situation as any.