CMF / CRF Details

CMF ID: 5576

Install a traffic signal


Prior Condition: Intersections were unsignalized

Category: Intersection traffic control

Study: Evaluating the Safety Effects of Signal Improvements, Schultz et al., 2014

Star Quality Rating: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.42
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: -42   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity:
Roadway Types: All
Number of Lanes:
Road Division Type:
Speed Limit: 30-65
Area Type: Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Not specified
Intersection Geometry: No values chosen.
Traffic Control: Not specified
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2002 to 2011
State: UT
Type of Methodology Used: Other before/after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Aug-12-2014
Comments: CMF for new signal installation of non-severe crashes.Hierarchical Bayesian Method is used.Four roadway types: other principal arterials, other freeway/expressway,minor arterial,and major collectors.