CMF / CRF Details

CMF ID: 3571

Install shoulder rumble strips

Description:

Prior Condition: No Prior Condition(s)

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: 3 Stars   [View score details]
Rating Points Total: 100
Crash Modification Factor (CMF)
Value: 2.39
Adjusted Standard Error:
Unadjusted Standard Error: 1.4201
Crash Reduction Factor (CRF)
Value: -139   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 142.01
Applicability
Crash Type: Run off road,Truck related
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: Rural
Traffic Volume: Minimum of 861 to Maximum of 6205 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: MO
Country: U.S.A.
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 4 crashes before, 3 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 (see p. 50).