Since the 1980s, races for classic motorcycles have been run on a reduced version of the Chimay road circuit under the banner of the Grand Prix des Frontières. The full circuit was used for the 2008 anniversary races, but since that year the full circuit has been reserved for special occasions, with the regular annual events using the shorter course.
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Pictures and more:
http://www.circuitsofthepast.nl/en-US/chimay