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Placer County California has purchased a road encyclopedia describing
one thousand roads averaging one mile in length. This one thousand miles of roadway averages 46 persons living on each mile, and one accident per year on each one-and-a-half miles of road.
Allen Klahn
"Photologging Under Contract At The County Level Part 2.", Proc. SPIE 0037, New Developments in Optical Instrumentation: A Problem Solving Tool in Highway and Traffic Engineering, (11 October 1973); https://doi.org/10.1117/12.953739
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Allen Klahn, "Photologging Under Contract At The County Level Part 2.," Proc. SPIE 0037, New Developments in Optical Instrumentation: A Problem Solving Tool in Highway and Traffic Engineering, (11 October 1973); https://doi.org/10.1117/12.953739