"we learn to keep to the left of the road, but it might just as well have been the rule to keep to the right"
Traffic jam in Keswick, England
Creative Commons AttributionTraffic jam in Keswick, England - Credit: freefoto.com

To an American this statement might not make sense until you remember that in Britain, unlike in the States, cars drive on the left side of the road.

The Highway Code lists rules for British drivers.