CMF / CRF Details
Conversion of stop-controlled intersection to mini roundabout
Countermeasure ID: 11524
Description:
Prior Condition: Two-way stop controlled (TWSC) intersection
Category: Intersection geometry
Study: Developing Crash Modification Factors for Mini-Roundabouts, Avelar et al., 2023
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.5977 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.1462 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 40.23 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 14.62 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| Roadway Types: | Not specified |
| Street Type: | Two-Way |
| Minimum Number of Lanes: | 1 |
| Maximum Number of Lanes: | 3 |
| Number of Lanes Direction: | One Direction |
| Number of Lanes Comment: | |
| Crash Weather: | All |
| Road Division Type: | All |
| Minimum Speed Limit: | 15 |
| Maximum Speed Limit: | 50 |
| Speed Unit: | mph |
| 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: | No values chosen. |
| Traffic Control: | Stop-controlled |
| Major Road Traffic Volume: | Minimum of 643 to Maximum of 15138 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 240 to Maximum of 9555 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 5589 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 2222 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2003 to 2019 |
| Municipality: | |
| State: | WA |
| Country: | USA |
| Type of Methodology Used: | |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Sep 30, 2024 |
| Comments: | CMF is presented in Table 18 in the report. |
