CMF / CRF Details
Convert signalized intersection to multi-lane roundabout
Countermeasure ID: 9887
Description:
Prior Condition: Four Leg Signalized Intersection
Category: Intersection geometry
Study: Whether Conversion and Weather Matter to Roundabout Safety, , 2018
Study Type: Journal Article/Book
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 130 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 3.333 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.004 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -233.3 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.4 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 4 |
| Maximum Number of Lanes: | 4 |
| 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: | 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: | 4-leg |
| Traffic Control: | Roundabout |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2006 to 2016 |
| Municipality: | Region of Waterloo |
| State: | notusa |
| Country: | Canada |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 103 crashes before, 452 crashes after |
| Sample Size (sites): | 5 sites before, 5 sites after |
| Sample Size (site-years): | 135 site-years before, 101 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 11, 2019 |
| Comments: | |
