CMF / CRF Details
Conversion of signalized intersection into single- or multi-lane roundabout
Countermeasure ID: 4195
Description:
Prior Condition: Signalized intersection
Category: Intersection geometry
Study: Safety Effectiveness of Converting Signalized Intersections to Roundabouts, Gross et al., 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 100 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.29 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.07 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 71 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 7 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not Specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 15 |
| Maximum Speed Limit: | 35 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Urban and suburban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| 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: | Minimum of 5300 to Maximum of 52500 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2000 to 2009 |
| Municipality: | |
| State: | CO,FL,IN,MD,MI,NY,NC,SC,VT,WA |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 16 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2012 |
| Comments: | Conversion to 2 lane roundabout |
