CMF / CRF Details

CMF ID: 4525

10-ft to 20-ft conversion (median width)

Description: Convert a 10-ft traversable median to a 20-ft traversable median

Prior Condition:  10-ft wide traversable median

Category: Access management

Study: Crash Reduction Factors for Traffic Engineering and ITS Improvements, Harkey et al., 2008

Star Quality Rating:5 Stars  [View score details]
Rating Points Total:140
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.04
Crash Reduction Factor (CRF)
Value:11  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:4
Crash Type:Cross median
Crash Severity:Not specified
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:5
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:< = 5 Lanes
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 2600 to Maximum of 282000 Annual Average Daily Traffic (AADT)
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:No state(s) chosen.
Type of Methodology Used:Regression cross-section
Other Details
Included in Highway Safety Manual?Yes
Date Added to Clearinghouse:Dec 01, 2009
Comments:Full access control.