CMF / CRF Details

CMF ID: 10010


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

Crash Modification Factor (CMF)
Value:	0.938
Adjusted Standard Error:
Unadjusted Standard Error:	0.054

Crash Reduction Factor (CRF)
Value:	6.2 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:	5.4

Applicability
Crash Type:	All
Crash Severity:	All
Roadway Types:	Principal Arterial Interstate
Street Type:
Minimum Number of Lanes:	6
Maximum Number of Lanes:	8
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:	Not specified
Road Division Type:	Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:	Not specified
Traffic Volume:	Minimum of 133000 to Maximum of 184000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:	158746 Annual Average Daily Traffic (AADT)
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:	2011 to 2016
Municipality:
State:	VA
Country:	United States
Type of Methodology Used:	Before/after using empirical Bayes or full Bayes
Sample Size (crashes):	1516 crashes before, 373 crashes after
Sample Size (sites):	6 sites before, 6 sites after
Sample Size (site-years):	24 site-years before, 6 site-years after
Sample Size (miles):	12.4 miles before, 12.4 miles after
Sample Size (miles):	49.6 mile-years before, 12.4 mile-years after

Other Details
Included in Highway Safety Manual?	No
Date Added to Clearinghouse:	Jul 26, 2019
Comments:	Applies to a corridor with a mix of advisory variable speed limits, lane use control signals, and hard shoulder running along the corridor.