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Buses exiting 3rd Street Tunnel

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Order Number	00067365
Title	Buses exiting 3rd Street Tunnel
Collection ID	Security Pacific National Bank Collection
Location/Accession	L.A.-Streets-3rd.; A-004-062 4x5
Date	1979
Physical Description	1 photograph :col.
Description	A typical early morning platoon of transit buses exiting the Third Street Tunnel through Bunker Hill in downtown Los Angeles, taken in December 1979. These buses, supplied and operated by the Southern California Rapid Transit District, were used as the carefully-controlled traffic to induce air flow through the tunnel. With the cooperation of the Los Angeles Street Maintenance and Police Departments, these tests were run to make measurements inside the tunnel and beyond the exit in order to define the air flow characteristics. The results will be used in the design of partially-covered, depressed freeways which have no mechanical ventilation. Participating are the Federal Highway Adm. and Jet Propulsion Lab. Note the test director, Bain Dayman, in the yellow jacket pushing his bicycle, made necessary due to the one-way tunnel restriction.
Subject	Dayman, Bain. Southern California Rapid Transit District. Los Angeles (Calif.).--Department of Transportation. Los Angeles (Calif.).--Police Department. Federal Highway Administration. Jet Propulsion Laboratory (U.S.). Air--Pollution--California--Los Angeles. Express highways--California, Southern. Tunnels--California--Los Angeles. Buses--California--Los Angeles. Bicycles--California--Los Angeles. Third Street Tunnel (Los Angeles, Calif.).
Format	Photographic prints
Reproduction Information	Images available for reproduction and use. Please see the Ordering & Use page at http://tessa.lapl.org/OrderingUse.html for additional information.
Sub-Collection Name	Security Pacific National Bank Photo Collection