The
1920 Motor Transport Corps convoy left Washington, D.C., 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, but, 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. ==Aftermath==