CMF / CRF Details

CMF ID: 10449

Install shoulder rumble strips

Description:

Prior Condition:  No Prior Condition(s)

Category: Shoulder treatments

Study: Rectangular Rumble Strip Safety Evaluation, Storm et al., 2020

 
Star Quality Rating:5 Stars  [View score details]
Rating Points Total:140
Crash Modification Factor (CMF)
Value:0.68
Adjusted Standard Error:
Unadjusted Standard Error:0.056
Crash Reduction Factor (CRF)
Value:32  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:5.6
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
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:2012 to 2018
Municipality:
State:MN
Country:
Type of Methodology Used:Regression cross-section
Sample Size (crashes):322 crashes
Sample Size (sites):50 sites
Sample Size (site-years):222 site-years
Sample Size (mile-years):1710.59 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 14, 2020
Comments:This CMF is for Total crashes.