Construction of Angeles Crest Highway began in 1929. It was originally intended to be a fire access road. In 1941 construction stopped because of World War II. In 1946, after the war, construction resumed; the completed highway eventually opened in 1956. The road was constructed by prison labor from Camp 37, which has since been razed. Division of Highways (now known as CalTrans) staff lived at a site called Cedar Springs. The staff is now located at Chilao Flats. Children of the staff attended Chilao Mountain School, a one-room school; the school has been closed for several years.