Development of a Comprehensive Database System for Safety Analyst

Table 4

Results of basic network screening with peak searching on roadway segments and CV tests from safety analyst for fatal and all injury crashes on roadway and ramp segments as well as intersections, using default, and calibrated SPFs.

Analyses type	Rank	Site Subtype	Route	Location with highest potential for safety improvement
				Start Location	End location	Average observed crashes	Predicted crash frequency	Excess crash frequency
								Excess frequency	Variance	Number of fatalities	Number of injuries
Default SPF; calibration factor (CF) = 1.0	1	158	IR15	40.223	40.323	267.05	21.49	219.41	408.32	2.04	312.21
	2	153	SR589	3.311	3.411	154.14	4.63	139.86	149.66	1.51	211.41
	3	158	IR15	41.386	41.486	173.08	27.10	133.70	609.28	1.24	190.24
	4	158	IR15	35.112	35.768	142.14	23.27	107.04	451.76	0.99	152.32
	5	153	SR612	4.605	5.124	114.01	5.28	102.18	182.06	1.10	154.46
	6	153	SR593	0.889	1.574	103.06	9.51	90.25	544.53	0.97	136.42
	7	153	SR159	29.664	30.193	101.96	8.06	90.19	396.04	0.97	136.33
	8	153	SR612	5.124	5.633	98.84	2.63	86.57	53.97	0.93	130.86
	9	153	SR593	3.784	6.361	94.92	3.99	84.30	107.53	0.91	127.42
	10	153	Las Vegas Blvd.	26.032	26.112	87.10	6.22	75.67	239.96	0.82	114.37
Calibrated SPF; Site Subtype 158 CF = 0.17; Site Subtype 153 CF = 4.27	1	158	IR15	40.223	40.323	291.56	20.43	238.49	379.89	2.21	339.36
	2	158	IR15	41.386	41.486	189.06	25.76	147.70	558.06	1.37	210.18
	3	153	SR589	3.311	3.411	156.48	19.18	135.02	2165.74	1.46	204.09
	4	158	IR15	35.668	35.768	155.78	22.12	118.56	414.43	1.10	168.71
	5	153	SR612	5.324	5.424	100.37	10.91	87.08	707.86	0.94	131.63
	6	158	IR15	41.567	41.667	118.14	24.19	84.46	483.08	0.78	120.18
	7	153	Decatur Blvd.	4.624	4.64	106.95	8.99	77.99	483.52	0.84	117.89
	8	158	IR15	41.667	41.767	105.53	22.24	74.20	409.34	0.69	105.58
	9	153	SR596	5.293	5.393	82.73	7.85	72.04	371.99	0.78	108.89
	10	153	Maryland Pkwy.	9.794	9.894	82.69	11.22	69.51	745.94	0.75	105.07

Crashes/mi/year; crashes/mi²/year.