And in simpler ways. One winter night I was riding up a snowy hill. I began to slip so I got off the bike and moved to the sidewalk. Just then a car passed me but 10 feet later it lost traction. I continued walking up the sidewalk and the car had to figure out how to safely turn around and then another way to get get to his destination. When I turned around at the top of the hill to look, the car was still there.