CMF / CRF Details

CMF ID: 9144

Install a traffic signal

Description:

Prior Condition:  Unsignalized intersection

Category: Intersection traffic control

Study: A full Bayes before-after study accounting for temporal and spatial effects: Evaluating the safety impact of new signal installations, Sacchia et al., 2016

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:120
Crash Modification Factor (CMF)
Value:0.84
Adjusted Standard Error:
Unadjusted Standard Error:0.054
Crash Reduction Factor (CRF)
Value:16  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:5.4
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Not specified
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:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban and suburban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:Not specified
Traffic Control:Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2005 to 2013
Municipality:British Columbia
State:notusa
Country:Canada
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (sites):19 sites before, 19 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2018
Comments: