CMF / CRF Details

CMF ID: 2919


Star Quality Rating:	[View score details]
Rating Points Total:	95

Crash Modification Factor (CMF)
Value:	0.77
Adjusted Standard Error:
Unadjusted Standard Error:	0.3

Crash Reduction Factor (CRF)
Value:	23 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:	30

Applicability
Crash Type:	Rear end
Crash Severity:	A (serious injury),B (minor injury),C (possible injury)
Roadway Types:	Principal Arterial Other
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:	Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:	All
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:	2001 to 2006
Municipality:	Scottsdale
State:	AZ
Country:
Type of Methodology Used:	Before/after using empirical Bayes or full Bayes

Other Details
Included in Highway Safety Manual?	No
Date Added to Clearinghouse:	Mar 21, 2011
Comments:	CMF is for "target" crashes. "Target" crashes are defined as those that occur during non-peak periods (specific to TOD). Peak periods (6AM - 9 AM and 4PM - 7PM); Non-peak periods (remaining 18 hrs for weekdays, 24 hrs for weekends and holidays). The authors of this study also experimented with producing additional CMFs from the same dataset using alternative, less reliable methods. Since this did not add new knowledge to this topic, these CMFs were not included in the Clearinghouse.