Design Criteria for Improving Safety Performance of Rural Intersections

Table 4

Overview of the calibrated , , CMFs and C_i compared with the HSM solutions.

	HSM functions without re-adjusting the coefficients to local data	Adjusting the HSM functions to local data
NSPF,3ST
CMF 1		Intersections belonging to tangent segments
		Intersections belonging to circular curves
CMF 2	0.56 (1 approach) 0.31 (2 approaches)	CMF2+3 equals 0.60 (only 1 approach observed)
CMF 3	0.86 (1 approach) 0.74 (2 approaches)
CMF 4	1−0.38·pni with pni equals 0.26	0.80
Ci	1.5	0.73