CMF / CRF Details

CMF ID: 8333

Install directional median openings at downstream U-turn locations

Description:

Prior Condition:  Intersections with full median opening

Category: Alignment

Study: Safety Impacts of Directional Median Openings at Downstream U-Turn Locations, Qi et al., 2016

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
Crash Modification Factor (CMF)
Value:Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:8
Maximum Number of Lanes:8
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:45
Maximum Speed Limit:45
Speed Unit:mph
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:Minimum of 1200 to Maximum of 1600 Vehicles Per Hour
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
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Average Minor Road Volume :
Development Details
Date Range of Data Used:2007 to 2011
Municipality:Houston
State:TX
Country:
Type of Methodology Used:Regression cross-section
Sample Size (crashes):64 crashes
Sample Size (sites):16 sites
Sample Size (site-years):80 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2017
Comments:CMFs of placing a directional median open at location 1 in comparison to at location 2

View the Full Study Details