Driver takes new type of truck for hauling combustible rubbish through a serpentine course in a five-part test to qualify drivers for the new trucks being staged at Chávez Ravine. This test is one in which a driver must start with a course which simulates conditions in a narrow alleyway. It starts with a 1 1/2 foot clearance on each side, and narrows down to three inches. Photo dated: April 3, 1957.
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