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.