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March 3, 2008
A new study from a Japanese research group explains why we’re occasionally caught in traffic jams for no visible reason. The real origin of traffic jams often has nothing to do with obvious obstructions such as accidents or construction work but is simply the result of there being too many cars on the road.
How many cars are there in the world currently?
It is estimated that over 600,000,000 passenger cars travel the streets and roads of the world today.
In the United States alone, 247,421,120 "highway" registered vehicles were counted in 2005, of which 136,568,083 passenger cars. (Bureau of Transportation Statistics U.S. Department of Transportation)