CMF / CRF Details
Conversion of signalized intersection into single- or multi-lane roundabout
Countermeasure ID: 6161
Description:
Prior Condition: Four-leg signalized intersection with left-turn lane on major route
Category: Intersection geometry
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.035 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.366 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -3.5 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 36.6 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| 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: | Undivided |
| Minimum Speed Limit: | 50 |
| Maximum Speed Limit: | 50 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2003 to 2011 |
| Municipality: | Bellingham |
| State: | WA |
| Country: | |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 214 crashes |
| Sample Size (sites): | 6 sites |
| Sample Size (site-years): | 42 site-years |
