Bureau of Transportation Statistics (BTS)
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Table 5 - Accident Occurrence Rate Regression Analyses Results

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  Property damage Fatality Injury
Coefficient t-value Coefficient t-value Coefficient t-value
Arterial-Local-Collector: Intercept 4.7E-7 -3.9189995 4.15E-5 -2.8057275 5.95E-9 6.1740294
Arterial-Local-Collector: Q 2.1937 5.1888142 0.7357 1.7986337 2.5084 7.1900767
Arterial-Local-Collector: M 0.4592 1.3204427 0.8945 2.6580631 0.7366 2.5664179
Arterial-Local-Collector: R2 0.65   0.42   0.80  
Freeway and Expressway: Intercept 0.0139 -1.7571000 7.7523 0.7731267 0.1851 0.9552417
Freeway and Expressway: Q 0.9508 3.9950085 -0.1435 -0.5537863 0.6837 3.9563777
Freeway and Expressway: M 0.2317 1.2375911 0.6553 3.2139405 0.501 3.6822804
Freeway and Expressway: R2 0.63     0.43   0.76
Interstate: Intercept 3.23E-5 -1.5835942 7.79E-5 -0.9158328 3.11E-10 0.9158328
Interstate: Q 1.0924 1.8072909 0.8066 0.8808309 2.0963 0.8808309
Interstate: M 0.9043 4.7104977 0.3316 0.6027988 0.9766 0.6027988
Interstate: R2 0.72     0.11   0.81