CMF / CRF Details

CMF ID: 9735

Presence of driveway on an intersection approach corner


Prior Condition: No driveways within 50 feet of any approach corner at a signalized intersection

Category: Access management

Study: Safety Evaluation of Corner Clearance at Signalized Intersections, Le et al., 2018

Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.67
Adjusted Standard Error:
Unadjusted Standard Error: 0.13
Crash Reduction Factor (CRF)
Value: 33   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 13
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 4-leg
Traffic Control: Signalized
Major Road Traffic Volume: Minimum of 10406 to Maximum of 93000 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 500 to Maximum of 48000 Annual Average Daily Traffic (AADT)
Average Major Road Volume : 37945 Annual Average Daily Traffic (AADT)
Average Minor Road Volume : 8598 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used: 2009 to 2011
State: CA, NC
Country: United States
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 3685 crashes
Sample Size (sites): 275 sites
Sample Size (site-years): 825 site-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Oct-27-2018
Comments: This CMF is for the presence of a driveway on 2 approach corners within 50 feet of a signalized intersection compared to no driveways present.