CMF / CRF Details
Convert to roundabout interchanges
Countermeasure ID: 11166
Description: Convert to interchange roundabouts with either a single roundabout or a pair.
Prior Condition: Signal-controlled ramp terminal on diamond interchange
Category: Interchange design
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 75 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.954 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 4.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| Street Type: | Not Specified |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | Not Specified |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | mph |
| Speed Limit Comment: | Posted speed limits for freeways were between 55 mph and 70 mph. Posted speed limits for crossroads were between 35 mph and 45 mph. |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| 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 7493 to Maximum of 30700 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 1900 to Maximum of 9400 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | MO,WI |
| Country: | USA |
| Type of Methodology Used: | |
