CMF / CRF Details

CMF ID: 8445

Install intersection conflict warning systems (ICWS) for four-lane at two-lane intersections

Description:

Prior Condition:  No intersection conflict warning systems

Category: Signs

Study: Multi-State Safety Evaluation of Intersection Conflict Warning Systems (ICWS), Himes et al, 2016

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Value:1.05
Adjusted Standard Error:
Unadjusted Standard Error:0.39
Crash Reduction Factor (CRF)
Value:-5  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:39
Applicability
Crash Type:All
Crash Severity:A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:4
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:Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:4-leg
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:
Municipality:
State:MN
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):9 crashes after
Sample Size (sites):3 sites before, 3 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2017
Comments:Authors indicated that this CMF is based on small sample size and should be interpreted with caution.