CMF / CRF Details

CMF ID: 10225

Change median from paved to grass

Description: Change from a paved median to a grass median

Prior Condition: Paved median

Category: Roadside

Study: Estimation of bicycle crash modification factors (CMFs) on urban facilities using zero inflated negative binomial models, Raihan et al., 2019

 
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Crash Modification Factor (CMF)
Value: 0.72
Adjusted Standard Error:
Unadjusted Standard Error: 0.1
Crash Reduction Factor (CRF)
Value: 28   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 10
Applicability
Crash Type: Vehicle/bicycle
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 4
Road Division Type: Divided by Median
Speed Limit: 35-60 MPH
Area Type: Urban
Traffic Volume: Minimum of 2300 to Maximum of 120000 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 24826 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: 2011 to 2014
Municipality:
State: FL
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 1174 crashes
Sample Size (miles): 1573 miles
Sample Size (mile-years): 6292 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-07-2019
Comments: This CMF applies to vehicle-bicycle crashes on urban four-lane divided highways with medians between 10 and 60 feet wide.