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DORTMUND, Germany (Reuters) - About three million people turned a busy motorway into one of the biggest open-air festivals in Germany’s history on Sunday.

A 60 km (36 mile)-long section of the A40 Autobahn between the western German cities of Dortmund and Duisburg was closed to motorists and turned over to pedestrians, cyclists, skaters and picnickers.

The event called “Still Life” was part of celebrations for the Ruhr region Cultural Capital of Europe 2010. The area, once Germany’s industrial heartland, is home to 5.3 million people.

Some 20,000 tables were set up on the motorway for what organizers called “the longest banquet in the world.” They said three million people had taken part.

Television pictures from the air showed crowds milling around on a road where cars usually race along at speeds of 160 kph (100 mph) or more.

Hannelore Kraft, state premier of North Rhine-Westphalia state, was among the revelers. She rode a bicycle and said the event should be repeated.

“This is fantastic,” Kraft said. “I grew up right next to the A40 and still live close to it. It’s great to see it now without cars but with so many people and so much cultural variety.”