Left Hand Driving

Fact of the Day: drive-on-the-left locations
No one knows for sure, but some suggest that left-side driving originated from the fact that carriage drivers liked to sit on the right to give their whip hands more freedom. In the Middle Ages, one kept to the left for the simple reason that one never knew when someone unfriendly would come along, and driving on the left kept the right arm free to hold a sword. This custom was given official sanction in 1300 AD, when Pope Boniface VIII invented the modern science of traffic control by declaring that pilgrims headed to Rome should keep left. The first known keep-right law in the U.S. was enacted in Pennsylvania in 1792, and the other states and Canadian provinces followed suit.

A comic aside states that men tend to sleep on the right side of the bed because even in bed they want to be in the driver's seat.