CMF / CRF Details

CMF ID: 8463

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:	[View score details]

Crash Modification Factor (CMF)
Value:	0.45
Adjusted Standard Error:
Unadjusted Standard Error:	0.069

Crash Reduction Factor (CRF)
Value:	55 (This value indicates a decrease* in crashes)*
Adjusted Standard Error:
Unadjusted Standard Error:	6.9

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
Road Division Type:
Speed Limit:
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, MO, NC
Country:
Type of Methodology Used:	Before/after using empirical Bayes or full Bayes
Sample Size (crashes):	58 crashes after
Sample Size (sites):	14 sites before, 14 sites after

Other Details
Included in Highway Safety Manual?	No
Date Added to Clearinghouse:	Jan-17-2017
Comments:	CMF for 2-lane at 2-lane intersections

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