Transcontinental Motor Convoy - 1920 Motor Transport Corps Convoy

The 1920 Motor Transport Corps convoy left Washington on 14 June 1920 and followed the Bankhead Highway to San Diego, California, where it arrived on 2 October. A smaller expedition than the first, the second convoy consisted of 50 vehicles, 32 officers, and 160 enlisted men under Col John F. Franklin. A rate of 45–60 miles per day was initially estimated, commensurate with that of the first convoy.

The convoy's trip proceeded smoothly as far as Atlanta. However, as it moved west into Tennessee, its progress slowed. Detours became necessary due to flooding and the crossing of the "black gumbo" of the Mississippi River proved very problematic. Despite high hopes, the Southern United States proved to be the worst part of the trip. The convoy encountered almost impassable sands between Maricopa and Wellton, Arizona.

Like the first convoy, at every stop the expedition was met by local celebrations and dances. After 111 days and an average rate of less than 30 miles per day, the convoy reached the West Coast where an officer's banquet was given in San Diego. After its arrival in San Diego, the convoy then went north to Los Angeles and was broken up, its equipment distributed to California's public services as part of a program to make use of war surplus.

The officers of the expedition became convinced by their experience that the maintenance of a national highway system should be the province of the federal government, as supported by the Townsend Bill. However, despite the widespread friendly greetings received by the convoys across the nation, neither generated enough public support to ensure passage of the Townsend Bill, which failed and was replaced by the Federal Highway Act of 1921. Both convoys are identified on the Zero Milestone on the Ellipse in Washington, D.C.