The worst traffic jam in terms of duration occurred on the Beijing-Tibet expressway in Beijing, China, in August 2010 — and lasted for 12 days. The traffic congestion was so bad, it took some vehicles as long as three days to travel the 62-mile (100 km) expressway. Although some of the worst traffic jams in history have been caused by emergency evacuations, the particular jam on the Beijing-Tibet expressway was simply congestion from too many vehicles and did not have a discernible cause. The longest traffic jam in terms of distance was one that stretched for 109 miles (175.41 km) in Lyons-Paris in February 1980, and it was caused by vacationers returning to the city.
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