CMF / CRF Details

CMF ID: 3631

Install shoulder rumble strips on roadways with a shoulder width less than 5 feet

Description:

Prior Condition:  Roadway with no rumble strips and a shoulder width less than 5 feet

Category: Shoulder treatments

Study: NCHRP Report 641: Guidance for the Design and Application of Shoulder and Centerline Rumble Strips, Torbic et al., 2009

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
Crash Modification Factor (CMF)
Value:1.21
Adjusted Standard Error:
Unadjusted Standard Error:0.8686
Crash Reduction Factor (CRF)
Value:-21  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:86.86
Applicability
Crash Type:Run off road
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
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:Rural
Traffic Volume:Minimum of 180 to Maximum of 10386 Average Daily Traffic (ADT)
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:1997 to 2005
Municipality:
State:MN
Country:U.S.A.
Type of Methodology Used:Regression cross-section
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 21, 2011
Comments:The authors collected data on thru lanes and speed limits but did not provide those data in the report (see p. 50).