CMF / CRF Details
CMF ID: 11131
Convert to roundabout interchanges
Description:
Convert to interchange roundabouts with either a single roundabout or a pair.
Prior Condition: Stop-controlled ramp terminal on diamond interchange
Category: Interchange design
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.671 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 32.9 (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: | 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 25 mph and 55 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 2060 to Maximum of 17150 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 1300 to Maximum of 10900 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: | |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 25, 2022 |
| Comments: | AADT on exit ramps were between 1,300 and 10,900 vpd. AADT on entrance ramps were between 647 and 11,450 vpd. AADT on crossroad approaches were between 2,060 and 17,150 vpd. |
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