CMF / CRF Details

CMF ID: 3409

Install edgeline rumble strips on roadways with a shoulder width of 5 feet or greater

Description:

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

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: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.11
Adjusted Standard Error:
Unadjusted Standard Error: 0.5314
Crash Reduction Factor (CRF)
Value: -11   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 53.14
Applicability
Crash Type: Run off road
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not Specified
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
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).