CMF / CRF Details

CMF ID: 3379

Install centerline rumble strips on tangent sections

Description:

Prior Condition: No centerline rumble strips

Category: Roadway

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

 
Star Quality Rating: 5 Stars   [View score details]
Rating Points Total: 140
Crash Modification Factor (CMF)
Value: 0.92
Adjusted Standard Error:
Unadjusted Standard Error: 0.043
Crash Reduction Factor (CRF)
Value: 8   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 4.3
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
Area Type: Rural
Traffic Volume: Minimum of 574 to Maximum of 20784 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 2006
Municipality:
State: MN, PA, WA
Country: U.S.A.
Type of Methodology Used: 2
Sample Size (crashes): 1368 crashes before, 691 crashes after
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.