CMF / CRF Details

CMF ID: 9821

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:105
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.09
Crash Reduction Factor (CRF)
Value:45  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:9
Crash Type:All
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):483 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 Total crashes. Total crashes are defined as all crashes within 100 ft of intersection (all types and severities combined)