Lansing Car Assembly was a General Motors automobile factory in Lansing, Michigan. It contained two elements, a 1901 automobile plant in downtown Lansing, and the 1920 Durant Motors factory on Lansing's Far Westside.The Lansing plant was the longest-operating automobile factory in the United States when it closed on May 6, 2005, and one of General Motors last assembly plants where vehicle bodies were made at one plant, and then trucked to another plant to be finished.