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:
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: