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( ) SPF Results for TOT, FI, and SSOD Crashes on Selected Roadways Without Centerline Rumble Strips An empty cell in a row where an SPF was estimated indicates the corresponding regression coefficient was not statistically significant at the 0.15 level or the coefficient's sign was not of the expected direction.
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From page 272... ...
Table H-2. SPF results for FI crashes on two-lane rural roads based on all nontreatment sites.
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