CMF / CRF Details

CMF ID: 119


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

Crash Modification Factor (CMF)
Value:	0.93
Adjusted Standard Error:	0.28
Unadjusted Standard Error:	0.16

Crash Reduction Factor (CRF)
Value:	7 (This value indicates a decrease in crashes)
Adjusted Standard Error:	28
Unadjusted Standard Error:	16

Applicability
Crash Type:	Run off road,Single vehicle
Crash Severity:	A (serious injury),B (minor injury),C (possible injury)
Roadway Types:	Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:	Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:	Rural
Traffic Volume:
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 :

Development Details
Date Range of Data Used:
Municipality:
State:
Country:
Type of Methodology Used:	Before/after using empirical Bayes or full Bayes

Other Details
Included in Highway Safety Manual?	Yes. HSM lists this CMF in italics font to indicate that it has a lower reliability than bold font CMFs since it has an adjusted standard error of 0.2 to 0.3. HSM 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