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]
Crash Modification Factor (CMF)
Value: 0.32
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
Number of Lanes: 4 and 6
Road Division Type: Divided by Median
Speed Limit:
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:
State: CA
Country: USA
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)