CMF / CRF Details
CMF ID: 4876
Conversion of stop-controlled intersection to roundabout
Description: Conversion of stop-controlled intersection to roundabout
Prior Condition: Stop-controlled intersection not at an interchange
Category: Intersection geometry
Study: Evaluating the Performance and Safety Effectiveness of Roundabouts, , 2011
Star Quality Rating: | [View score details] |
Rating Points Total: | 125 |
Crash Modification Factor (CMF) | |
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Value: | 0.581 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.13 |
Crash Reduction Factor (CRF) | |
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Value: | 41.9 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 13 |
Applicability | |
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Crash Type: | All |
Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | |
Maximum Number of Lanes: | |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
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: | |
Intersection Geometry: | No values chosen. |
Traffic Control: | Roundabout |
Major Road Traffic Volume: | Minimum of 1000 to Maximum of 26366 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 500 to Maximum of 13750 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | 11181 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: | 2001 to 2010 |
Municipality: | |
State: | MI |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 29 crashes after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | May 01, 2013 |
Comments: | At NON-interchange locations ONLY |