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Right- and left-hand traffic
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. This is sometimes called the rule of the road. 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.
- Draper, Geoff (1993). "Harmonised Headlamp Design for Worldwide Application". Motor Vehicle Lighting : 23–36Society of Automotive Engineers.
- Kincaid, Peter (December 1986). The Rule of the Road: An International Guide to History and Practice. Greenwood Press. .
- Lucas, Brian (2005). "Which side of the road do they drive on?". http://www.brianlucas.ca/roadside/. Retrieved 2006-08-03.