CMF / CRF Details

CMF ID: 9762

Install centerline rumble strips

Description:

Prior Condition:  Two-lane undivided roadways

Category: Roadway

Study: Installation Guidance for Centerline and Edgeline Rumble Strips in Narrow Pavements, Savolainen et al., 2017

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Value:0.668
Adjusted Standard Error:
Unadjusted Standard Error:0.074
Crash Reduction Factor (CRF)
Value:33.2  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:7.4
Applicability
Crash Type:Other
Crash Severity:All
Roadway Types:Not specified
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:Not specified
Traffic Volume:Minimum of 10 to Maximum of 17700 Annual Average Daily Traffic (AADT)
Average Traffic Volume:2428 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:2014 to 2015
Municipality:
State:IA
Country:United States
Type of Methodology Used:Regression cross-section
Sample Size (crashes):1254 crashes
Sample Size (sites):13948 sites
Sample Size (site-years):27896 site-years
Sample Size (miles):5439.72 miles
Sample Size (mile-years):10879.4 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:This CMF applies to centerline-related crashes (run off road-left, run off road-straight/left, cross-centerline, head-on, sideswipe-same direction, sideswipe-opposite direction)