CMF / CRF Details
CMF ID: 5228
Conversion of intersection into low-speed roundabout
Description:
Conversion of intersection into low-speed roundabout
Prior Condition: The intersection was operating under no control,
yield, TWSC, AWSC, or signal control.
Category: Intersection geometry
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.473 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.113 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 52.73 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 11.3 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 4 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | All |
| 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: | Other |
| Major Road Traffic Volume: | Minimum of 4100 (total entering) to Maximum of 48100 (total entering) Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 1994 to 2010 |
| Municipality: | Statewide |
| State: | WI |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 55 crashes before, 26 crashes after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 01, 2013 |
| Comments: | - Study included three-yearbefore and after crash datafor each site.- In this case, the reported before-crashes represent the "expected crashes" after treatment.- "Traffic Control" includes intersections with yield control, two-way stop-control, all-way stop-control, and signal control.- Reported traffic volume is total entering volume. |
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