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"The measures take a fifth of the city's 3.61 million vehicles off roads each weekday, according to the Beijing Traffic Management Bureau.
The restrictions were first announced in October following public debate over whether to extend traffic restrictions that helped keep skies clear during the 2008 Beijing Olympics. They were set to expire at the end of this week.
The traffic bureau said on its Web site Sunday that the capital will continue to keep a third of government vehicles off the road altogether."