Influence of Multiple Freeway Design Features on Freight Traffic Safety

Table 4

Developed NB models.

Parameter	Large truck-involved crashes			Total crashes
	Coefficient	SE	-value	Coefficient	SE	-value
Constant	−17.7705	1.4104	<0.0001	−12.5632	0.3252	<0.0001
Ln(AADT)	2.0638	0.0587	<0.0001	1.3673	0.0278	<0.0001
Inside rumble strips	−0.3856	0.0969	<0.0001	−0.2389	0.0696	0.0006
Inside shoulder width	−0.0140	0.0074	0.0572	N/S	N/S	N/S
Outside rumble strips	−0.2086	0.0979	0.0332	−0.1692	0.0711	0.0669
Outside shoulder width	−0.0417	0.0129	0.0013	N/S	N/S	N/S
Curve	0.2053	0.0479	<0.0001	0.1073	0.0344	0.0018
No. of lanes ∗ Ln(AADT)	−0.0106	0.0033	0.0016	N/S	N/S	N/S
Lane width ∗ curve	−0.2600	0.1089	0.0169	N/S	N/S	N/S
AIC	11800.52			16516.13

N/S: not significant.