The Citroën Traction Avant is an automobile which was produced by the French manufacturer Citroën from 1934 to 1957. About 760,000 units were produced in three variants, the 7CV, 11CV and 15CV.
Left-hand drive versions were built in France, Belgium and Denmark, and right-hand drive cars in England. The English version of the 15CV was called the Big Fifteen or the "Big Six" in reference to its 6-cylinder engine.
The development costs of the Traction Avant series, combined with the redevelopment of its factory, were very high and Citroën declared bankruptcy in late 1934. The largest creditor was Michelin, who then owned Citroën from 1934 until 1976. Under Michelin, Citroën was run as a research laboratory, a test bed for their radial tires and new automotive technologies.