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In page Transport in North Korea:

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Fuel constraints and the near absence of private automobiles have relegated road transportation to a secondary role.[1] The road network was estimated to be around 31,200 kilometres (19,400 mi) in 1999, up from between 23,000 kilometres (14,000 mi) and 30,000 kilometres (19,000 mi) in 1990, of which only 1,717 kilometres (1,067 mi), 7.5%, are paved.[citation needed] However, The World Factbook (published by the US Central Intelligence Agency) lists 25,554 kilometres (15,879 mi) of roads with only 724 kilometres (450 mi) paved as of 2006.[2]