CMF / CRF Details

CMF ID: 10640


Star Quality Rating:	[View score details]
Rating Points Total:	145

Crash Modification Factor (CMF)
Value:	0.877
Adjusted Standard Error:
Unadjusted Standard Error:	0.041

Crash Reduction Factor (CRF)
Value:	12.3 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:	4.1

Applicability
Crash Type:	All
Crash Severity:	All
Roadway Types:	All
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:	All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:	Rural
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:	2008 to 2015
Municipality:	Alberta, British Columbia, and Quebec
State:	notusa
Country:	Canada
Type of Methodology Used:	Before/after using empirical Bayes or full Bayes
Sample Size (crashes):	2022 crashes before, 1047 crashes after
Sample Size (sites):	38 sites before, 38 sites after

Other Details
Included in Highway Safety Manual?	No
Date Added to Clearinghouse:	Feb 25, 2021
Comments:	In Alberta, the width of longitudinal pavement markings of both edges, the median (for divided highways), and the centerline (for undivided highways) were increased from 100 mm (4 in.) to 150 mm (6 in.). In British Columbia, only the width of the longitudinal median markings was increased from 100 mm (4 in.) to 200 mm (8 in.) for divided highways; for the undivided highways, only edge line markings were widened from 100 mm (4 in.) to 200 mm (8 in.). In Quebec, the edge line markings on both sides were widened from 100 mm (4 in.) to 200 mm (8 in.).