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"Of the 221 separately administered countries and territories in the world, 58 drive on the left and 163 on the right. In Britain it is believed that left hand driving is a legacy from the preference of passing an approaching horseman or carriage right side to right side to facilitate right armed defence against sudden attack. On the Continent postillions were mounted on the rearmost left horse in a team and thus preferred to pass left side to left side. While some countries have transferred from left to right, the only case recorded of a transfer from right to left is in Okinawa on 30 July 1978."
SOURCE: Guinness; The Book of Answers p.158
UPDATED: 4/08/2006