1920s - City adopts major traffic plan and simplified traffic code to deal with popularization of motor vehicles after World War I

1930 - Ralph T. Dorsey helps form the Bureau of Street Traffic Engineering as unity of the Police Department

1949 - Department of Traffic Engineering created to address post World War II growth

1953 - Change in the city charter creates Department of Traffic

February 25, 1979 - The Los Angeles Department of Transportation is formed by city ordinance

For more detail on LADOT’s history and to view era photographs, please see “Transportation Topics and Tales: Milestones in  Transportation History in Southern California,”  written by former Assistant General Manager John Fisher.