CMF / CRF Details

CMF ID: 4704

Convert high-speed rural intersection (3 leg) to roundabout

Description: Convert a high speed rural 3 leg intersection to a roundabout

Prior Condition: 3 leg intersection

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: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.28
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 72   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes: 1
Road Division Type:
Speed Limit: 45-65 mph
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
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, OR
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (site-years): 10 site-years before, 10 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: May-01-2013
Comments: