Yeah, we're not bred to them. When I was driving in France on a not-too-long-ago vacation, they petrified me and I'm sure I annoyed (if not endangered) the natives trying to figure them out at French highway speeds. And in Britain, on the left-hand side of the road? Fugeddaboudit!

But if we WERE bred to them--well, bicycling has made me keenly aware within my very body of the efficiency differential between stopping and merely slowing down.