CMF / CRF Details
CMF ID: 9797
Conversion of intersection into single-lane roundabout
Description:
Conversion of intersection into single-lane roundabout
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
| Crash Modification Factor (CMF) |
|---|
| Value: | 1.04 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.46 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | -4 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 146 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | All |
| 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: | Not specified |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | No values chosen. |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2005 to 2013 |
| Municipality: | |
| State: | FL,IN,NY,PA,WA |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Sample Size (sites): | 18 sites before, 18 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | Unknown intersection type to single lane roundabout The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development. |
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