CMF / CRF Details

CMF ID: 10985

Install raised median


Prior Condition:  No median island

Category: Access management

Study: Development of Crash Modification Factors for Intersections in Toowoomba city, Al-Marafi et al., 2020

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:80
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.132
Crash Reduction Factor (CRF)
Value:42  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:13.2
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:5
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Other
Major Road Traffic Volume:Minimum of 4500 to Maximum of 21784 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 1600 to Maximum of 14837 Annual Average Daily Traffic (AADT)
Average Major Road Volume :12546 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :5769 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2008 to 2015
Municipality:Toowoomba City
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Aug 11, 2021
Comments:This CMF is for installing a raised median island on major road approaches. Intersections are a combination of signalized and un-signalized.