CMF / CRF Details

CMF ID: 9784

Install concrete guardrail in median

Description:

Prior Condition:  Divided highway with open median

Category: Roadside

Study: Barrier-Relevant Crash Modification Factors and Average Crash Costs of Crashes on Arterial Roads in Indiana, Zou and Tarko, 2018

 
Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Value:2.68
Adjusted Standard Error:
Unadjusted Standard Error:0.28
Crash Reduction Factor (CRF)
Value:-168  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:28
Applicability
Crash Type:Other
Crash Severity:All
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
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:Not specified
Traffic Volume:
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:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2008 to 2012
Municipality:
State:IN
Country:United States
Type of Methodology Used:Regression cross-section
Sample Size (crashes):1604 crashes
Sample Size (sites):1258 sites
Sample Size (site-years):6290 site-years
Sample Size (miles):330 miles
Sample Size (mile-years):1650 mile-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:Applies to barrier-related crashes on one side of a divided highway. Barrier-related crashes include non-cross-median high-risk events, median barrier wall collision, near-median cable barrier collision, far-side median cable barrier collision, median guardrail face collision, non-cross-median moderate-risk event, vehicle redirected and hit another vehicle, roadside guardrail collision, cross-median head-on, and cross-median non-head-on crashes.