CMF / CRF Details

CMF ID: 4530

10-ft to 30-ft conversion (median width)

Description: Convert a 10-ft traversable median to a 30-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
Crash Modification Factor (CMF)
Value: 0.8
Adjusted Standard Error:
Unadjusted Standard Error: 0.07
Crash Reduction Factor (CRF)
Value: 20   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 7
Applicability
Crash Type: Cross median
Crash Severity: Not specified
Roadway Types: Not specified
Number of Lanes: 4
Road Division Type: Divided by Median
Speed Limit:
Area Type: Urban
Traffic Volume: Minimum of 4400 to Maximum of 131000 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:
Municipality:
State: No state(s) chosen.
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? Yes
Date Added to Clearinghouse: Dec-01-2009
Comments: Full access control