CMF / CRF Details

CMF ID: 4730

Convert high-speed rural intersection to roundabout

Description: Convert high-speed rural intersection to roundabout

Prior Condition: Stop controlled intersection (3 or 4 leg)

Category: Intersection geometry

Study: A Statistical Analysis and Development of a Crash Prediction Model for Roundabouts on High-Speed Rural Roadways, Isebrands, 2012

 
Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 60
Crash Modification Factor (CMF)
Value: 2.79
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: -179   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: Sideswipe
Crash Severity: All
Roadway Types: Not specified
Street Type:
Minimum Number of Lanes: 1
Maximum Number of Lanes: 2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit: 40
Maximum Speed Limit: 65
Speed Unit: mph
Speed Limit Comment:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 3-leg,4-leg
Traffic Control: Roundabout
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume : 14000 Annual Average Daily Traffic (AADT)
Average Minor Road Volume : 5600 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:
Municipality:
State: KS, MD, MN, OR, WA, WI
Country:
Type of Methodology Used: Simple before/after
Sample Size (site-years): 98 site-years before, 98 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: May-01-2013
Comments: