CMF / CRF Details

CMF ID: 9822

Install right-in-right-out (RIRO) operations at stop-controlled intersections


Prior Condition:  No Prior Condition(s)

Category: Access management

Study: Safety Effects of Turning Movement Restrictions at Stop-Controlled Intersections, Le et al., 2018

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.08
Crash Reduction Factor (CRF)
Value:68  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:8
Crash Type:Other
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:4 and 6 Lanes
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
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
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 13433 to Maximum of 75000 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 51 to Maximum of 2600 Annual Average Daily Traffic (AADT)
Average Major Road Volume :38724 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :519 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:
Type of Methodology Used:Regression cross-section
Sample Size (crashes):199 crashes
Sample Size (sites):138 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:This CMF compares urban, three-legged, stop-controlled intersections with RIRO operation to full movement. This CMF looks at Intersection-related crashes. Intersection-related crashes are defined as all crashes within 100 ft of intersection defined as 'intersection-related' by the reporting officer (all types and severities combined)