CMF / CRF Details

CMF ID: 5291

10-ft to 60-ft conversion (median width)

Description: Convert a 10-ft traversable median to a 60-ft traversable median

Prior Condition: Median width = 10ft

Category: Access management

Study: NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety, Stamatiadis et al., 2009

Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.62
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 38   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: Multiple vehicle
Crash Severity: All
Roadway Types: All
Number of Lanes:
Road Division Type: Divided by Median
Speed Limit:
Area Type: Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:
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:
State: CA, KY, MN
Type of Methodology Used: Regression cross-section
Sample Size (mile-years): 14897 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-02-2013