Sole

   About a quarter of the world drives on the left and the countries that do are mostly old British colonies. Strange the  In the past almost everybody traveled on the left side of the road. Since most people are right-handed, swordsmen preferred to keep to the left in order to have their right arm nearer to an opponent. 

Countries by handedness of traffic

  Right-hand traffic

  Left-hand traffic

      http://whatsideoftheroad.com/
       This a cool web site that you can go to. It tells you what countries that drive on the right or left. I wonder if its different to drive on the right side for half of their life and the rest on the left.