CMF / CRF Details

CMF ID: 11242

Conversion of stop-controlled intersection to mini roundabout


Prior Condition: Two-Way, Stop-Controlled (TWSC) / One-Way, Stop-Controlled (OWSC) intersection

Category: Intersection geometry

Study: Safety Effectiveness and the Role of Geometric, Traffic, and Crash History–Related Factors in Converting a Stop-Controlled Intersection to a Miniroundabout, Mishra et al., 2022

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 90
Crash Modification Factor (CMF)
Value: 1.08
Adjusted Standard Error:
Unadjusted Standard Error: 0.12
Crash Reduction Factor (CRF)
Value: -8   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 12
Crash Type: All
Crash Severity: O (property damage only)
Roadway Types: All
Street Type: Two-Way
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction: Both Directions
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: All
Minimum Speed Limit:
Maximum Speed Limit:
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 (not interchange related)
Intersection Geometry: 3-leg,4-leg
Traffic Control: Stop-controlled
Major Road Traffic Volume: Minimum of 1970 to Maximum of 14726 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 386 to Maximum of 6846 Annual Average Daily Traffic (AADT)
Average Major Road Volume : 7762 Annual Average Daily Traffic (AADT)
Average Minor Road Volume : 3668 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:
State: GA, IA, MI, MN, MO, NC, VA, WA
Country: USA
Type of Methodology Used:
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-06-2022