CMF / CRF Details

CMF ID: 5578

Install a traffic signal

Description:

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]
Rating Points Total: 40
Crash Modification Factor (CMF)
Value: 0.42
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 58   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: Head on
Crash Severity:
Roadway Types: All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit: 30
Maximum Speed Limit: 65
Speed Unit: mph
Speed Limit Comment:
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
Municipality:
State: UT
Country:
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 head-on crashes. Hierarchical Bayesian Method is used.