CMF / CRF Details
CMF ID: 10582
Roundabout geometry
Description: Various geometric elements of roundabout
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study: Developing crash modification factors for roundabouts using a cross-sectional method, Al-Marafi et al., 2020
Star Quality Rating: | [View score details] |
Rating Points Total: | 70 |
Crash Modification Factor (CMF) | |
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Value: | |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | Not specified |
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: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | |
If countermeasure is intersection-based | |
Intersection Type: | Roadway/roadway (not interchange related) |
Intersection Geometry: | No values chosen. |
Traffic Control: | Roundabout |
Major Road Traffic Volume: | Minimum of 1288 to Maximum of 16071 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 1200 to Maximum of 10002 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | 6966 Annual Average Daily Traffic (AADT) |
Average Minor Road Volume : | 4341 Annual Average Daily Traffic (AADT) |
Development Details | |
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Date Range of Data Used: | 2010 to 2015 |
Municipality: | Toowoomba City |
State: | notusa |
Country: | Australia |
Type of Methodology Used: | Regression cross-section |
Sample Size (sites): | 49 sites |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Dec 17, 2020 |
Comments: | CMFunction for diameter of the central island (m) |