CMF / CRF Details

CMF ID: 8466

Install an intersection conflict warning system (ICWS) with post mounted signs (various messages) and flashers in advance of the intersection on major; loop on minor

Description: Install an intersection conflict warning system (ICWS) with post mounted signs (various messages) and flashers in advance of the intersection on major; loop on minor

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: 5 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.734
Adjusted Standard Error:
Unadjusted Standard Error: 0.083
Crash Reduction Factor (CRF)
Value: 26.6 (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8.3
Applicability
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes: 2 to 4
Road Division Type:
Speed Limit:
Area Type: Rural
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:
Development Details
Date Range of Data Used:
Municipality:
State: MN, MO, NC
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 138 crashes after
Sample Size (sites): 12 sites before, 12 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jan-17-2017
Comments: CMF for 4-lane at 2-lane intersections

[View the Full Study Details]

 

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