CMF / CRF Details

CMF ID: 588


Star Quality Rating:	[View score details]
Rating Points Total:	75

Crash Modification Factor (CMF)
Value:	0.94
Adjusted Standard Error:	0.06
Unadjusted Standard Error:

Crash Reduction Factor (CRF)
Value:	6 (This value indicates a decrease in crashes)
Adjusted Standard Error:	6
Unadjusted Standard Error:

Applicability
Crash Type:	All
Crash Severity:	A (serious injury),B (minor injury),C (possible injury)
Roadway Types:	Major Collector,Minor Collector
Street Type:
Minimum Number of Lanes:	2
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:	> = 2 Lanes
Crash Weather:	Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:	Urban
Traffic Volume:	Minimum of 5000 to Maximum of 30000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :

Other Details
Included in Highway Safety Manual?	Yes. HSM lists this CMF in bold font to indicate that it has the highest reliability since it has an adjusted standard error of 0.1 or less. However, it also includes an asterisk (*) to indicate that the CMF value itself is within the range 0.90 to 1.10, but that the confidence interval defined by the CMF ± two times the standard error may contain the value 1.0. This is important to note since a treatment with such an CMF could potentially result in (a) a reduction in crashes (safety benefit), (b) no change, or (c) an increase in crashes (safety disbenefit). HSM recommends that this CMF should be used with caution.
Date Added to Clearinghouse:	Dec 01, 2009
Comments:	Countermeasure name changed to match HSM