CMF / CRF Details

CMF ID: 199

Road diet (Convert 4-lane undivided road to 2-lanes plus turning lane)

Description:

Prior Condition: No Prior Condition(s)

Category: Roadway

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

 
Star Quality Rating: 5 Stars
Crash Modification Factor (CMF)
Value: 0.71
Adjusted Standard Error: 0.02
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 29   (This value indicates a decrease in crashes)
Adjusted Standard Error: 2
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Minor Arterial
Number of Lanes: 4
Road Division Type:
Speed Limit:
Area Type: Urban
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:
Municipality:
State:
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? Yes. HSM lists this CMF in bold font to indicate that it has the highest reliability since it has an adjusted standard error of 0.1 or less.
Date Added to Clearinghouse: Dec-01-2009
Comments: