CMF / CRF Details

CMF ID: 8709

Increase median width


Prior Condition:  Roadways with narrower median width

Category: Access management

Study: Evaluation of Safety Effectiveness of Multiple Cross Sectional Features on Urban Arterials, Park and Abdel-Aty, 2016

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Vehicle/bicycle
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Principal Arterial Other
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:8
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:All
Minimum Speed Limit:20
Maximum Speed Limit:65
Speed Unit:mph
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 1000 to Maximum of 94500 Annual Average Daily Traffic (AADT)
Average Traffic Volume:31880 Annual Average Daily Traffic (AADT)
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2008 to 2012
Type of Methodology Used:Regression cross-section
Sample Size (crashes):2170 crashes
Sample Size (sites):6420 sites
Sample Size (site-years):32100 site-years
Sample Size (miles):2514 miles
Sample Size (mile-years):12570 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 06, 2017
Comments:This CMF is for KABC crashes. CMF applies to urban arterials.