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1906
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The Automobile Club of Southern California (ACSC) erects its first guide signs between Ocean Park and Los Angeles.
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1908
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The California State Automobile Association (CSAA) erects its first guide sign at 19th Avenue and Parkside Boulevard in
San Francisco.
CSAA erects yellow and blue diamond guide signs in San Francisco, San Mateo, Santa Clara, Alameda, Contra Costa, Marin,
Sacramento, San Joaquin, Merced and Fresno counties.
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1910
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ACSC has erected 2,400 signs.
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1911
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ACSC erects railroad crossing warning signs.
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1914
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ACSC erects signs on the National Old Trails Road from Los Angeles to Kansas City.
CSAA begins signing in Northern and Central California.
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1915
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ACSC erects signs on the Midland Trail from Los Angeles to Ely, Nevada.
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1916
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ACSC erects signs on the Old Spanish Trail from San Diego to Kent, Texas.
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1917
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CSAA erects yellow and blue diamond guide signs on the Lincoln Highway from San Francisco to Salt Lake City.
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1918
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CSAA signs have a code number on the back of each sign that identifies the sign location on a county map.
CSAA has erected 8,000 signs.
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1921
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ACSC and CSAA assume responsibility for the maintenance of El Camino Real bells and guide signs.
CSAA erects yellow and blue diamond guide signs on the Victory Highway from San Francisco to Kansas City.
CSAA erects yellow and blue diamond guide signs on the Coast and Valley routes. CSAA is abbreviated and logo is included.
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1925
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ACSC erects its first STOP BOULEVARD sign in Coronado.
CSAA erects new signs: ONE WAY STREET, STOP BOULEVARD, NO LEFT TURN HERE, ICE DRIVE SLOWLY.
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1927
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CSAA erects illuminated STOP ARTERIAL signs in San Francisco.
Manual on Uniform Signing and Traffic Control published.
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1928
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ACSC and CSAA erect black and white US route shields on US routes in California.
CSAA adopts the Federal Road Sign Plan and begins to replace yellow and blue diamond guide signs with black and white
rectangular signs. Yellow diamond signs are retained for warning signs only.
CSAA has erected 84,000 signs in Northern and Central California.
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1929
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CSAA erects black and white rectangular guide signs showing elevation at 1,000 foot intervals on US 40 and US 50.
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1932
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ACSC and CSAA erect large reflectorized guide signs. Warning signs are reflectorized.
CSAA replaces black and white rectangular guide signs with improved ones containing a broad arrow and larger lettering.
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1933
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State Sign Committee organized.
ACSC and CSAA contract with the State to erect signs on State highways. State pays actual cost of sign material only.
DOH assumes responsibility for the maintenance of El Camino Real bells and guide signs.
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1934
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ACSC and CSAA erect black and white State route shields on State highways. The new sign is in the shape of a miner's
spade and displays a grizzly bear from the State flag. Often called a "bear shield".
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1935
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Governor Rolph vetos legislation designed to prohibit ACSC and CSAA from placing their signs on State highways. ACSC
and CSAA continue signing and agree to include only club logo on new signs.
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1937
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CSAA has erected 135,000 signs in Northern and Central California.
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1942
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Requirement for metal signs suspended during World War II. Wood signs are erected.
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1943
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Plastic reflectors replace glass reflectors on new signs.
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1947
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ACSC and CSAA cease signing activities on State Highways. ACSC and CSAA continue to erect signs for cities and counties.
The State Division of Highways (DOH) begins signing on State highways.
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1956
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ACSC ceases erecting signs after 50 years.
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1958
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CSAA erects signs for 24 counties and 114 cities.
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1964
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DOH replaces black and white shield with new green and white reflectorized aluminum sign.
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1969
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CSAA ceases erecting signs after 61 years.
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