Influence of Multiple Freeway Design Features on Freight Traffic Safety

Table 6

Safety effects estimation functions for total crashes.

Freeway design elements	NB		MARS
	Functions	Interaction term	Functions	Interaction term
Inside rumble strips (IRS)		N/A	}	IRS  AADT, IRS  ISW
Outside rumble strips (ORS)		N/A		N/A
Inside shoulder width (ISW)	N/A	N/A		ISW  AADT, ISW  IRS, ISW  Curve

N/A: not available.