CMF / CRF Details

CMF ID: 2740

Convert four-leg intersection into two three-leg intersections

Description:

Prior Condition:  4-legged

Category: Intersection geometry

Study: NCHRP Report 650 - Median Intersection Design for Rural High-Speed Divided Highways, Maze et al., 2010

 
Star Quality Rating:1 Star  [View score details]
Rating Points Total:10
Crash Modification Factor (CMF)
Value:2
Adjusted Standard Error:
Unadjusted Standard Error:1.73
Crash Reduction Factor (CRF)
Value:-100  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:173.2
Applicability
Crash Type:Angle
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
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:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,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:1999 to 2005
Municipality:Fort Dodge
State:IA
Country:USA
Type of Methodology Used:Simple before/after
Sample Size (crashes):2 crashes before, 4 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 21, 2011
Comments:Countermeasure name has been slightly modified for consistency across Clearinghouse