CMF / CRF Details
CMF ID: 4705
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: | [View score details] |
Rating Points Total: | 70 |
Crash Modification Factor (CMF) | |
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Value: | 0.17 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 83 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | Angle |
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 | |
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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 |