CMF / CRF Details
CMF ID: 9447
Convert to roundabout interchanges
Description:
Convert to interchange roundabouts with either a single roundabout or a pair.
Prior Condition: Interchanges without roundabout ramp terminals
Category: Interchange design
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.769 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 23.1 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 1 |
| Maximum Number of Lanes: | 1 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 25 |
| Maximum Speed Limit: | 45 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (interchange ramp terminal) |
| Intersection Geometry: | No values chosen. |
| Traffic Control: | Roundabout |
| Major Road Traffic Volume: | Minimum of 2060 to Maximum of 16715 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 647 to Maximum of 5630 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 8186 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 2721 Annual Average Daily Traffic (AADT) |
| Development Details |
|---|
| Date Range of Data Used: | 2003 to 2016 |
| Municipality: | |
| State: | MO |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 67 crashes after |
| Sample Size (sites): | 7 sites before, 7 sites after |
| Sample Size (site-years): | 27.5 site-years before, 33.5 site-years after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | This CMF is for PDO crashes at single-lane roundabout ramp terminals. Number of lanes and speed limits entered here are for ramps. |
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