Variable

Poisson (Log-link)

Negative Binomial (Log-link)

C

P

C

P

Intercept

−3.92

<0.01

−4.17

<0.01

# of main tracks

1.49

<0.01

1.68

<0.01

Posted highway speed Limit

−0.02

0.03

−0.02

0.05

Likelihood Ratio Chi-Square

90.2

<0.01

84.4

<0.01

AIC

1176.6

1157.4

AICC

1176.6

1157.4

Deviance

891.8

760.7