norman w. garrick wesley marshall
TRANSCRIPT
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0 5
45
85
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0 10 20 30 40 50
% C
han
ce o
f F
ata
lity
Impact Speed (mph)
Source: U.K. Department of Transportation, Killing Speed and Saving Lives, London, 1987.
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Pre-1950’s
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Grid
Tree
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550 Intersections per Square Mile
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110 Intersections per Square Mile
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45 Intersections per Square Mile
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