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Right- and left-hand traffic

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     Right-hand traffic      Left-hand traffic
A sign on Australia's Great Ocean Road reminding foreign drivers to keep left.

The driving side of a road is the side on which traffic flows. Each country says whether traffic will keep on the right-hand or left-hand side of the road.[1] This is sometimes called the rule of the road.[2] This basic rule makes traffic move easier. It also reduces the risk of head-on collisions. Today about 66.1% of the world's people live in countries who drive on the right-hand. 33.9% live in countries that drive on the left-hand.[3]


  1. Draper, Geoff (1993). "Harmonised Headlamp Design for Worldwide Application". Motor Vehicle Lighting : 23–36Society of Automotive Engineers. 
  2. Kincaid, Peter (December 1986). The Rule of the Road: An International Guide to History and Practice. Greenwood Press. ISBN 0-313-25249-1 .
  3. Lucas, Brian (2005). "Which side of the road do they drive on?". Retrieved 2006-08-03.