CMF / CRF Details

CMF ID: 1974

Changeable Curve Speed Warning signs


Prior Condition:  prior

Category: Advanced technology and ITS

Study: An Evaluation of Dynamic Curve Warning Systems in the Sacramento River Canyon, Tribbet, L., McGowen, P., and Mounce, J., 2000

Star Quality Rating:1 Star  [View score details]
Rating Points Total:0
Crash Modification Factor (CMF)
Adjusted Standard Error:4
Unadjusted Standard Error:3
Crash Reduction Factor (CRF)
Value:0  (This value indicates a decrease in crashes)
Adjusted Standard Error:31
Unadjusted Standard Error:2
Crash Type:Single vehicle,Speed related
Crash Severity:
Roadway Types:Principal Arterial Other Freeways and Expressways
Street Type:
Minimum Number of Lanes:5
Maximum Number of Lanes:5
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:55
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/bicycle path or trail
Intersection Geometry:4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 2 to Maximum of 3
Minor Road Traffic Volume:Minimum of 4 to Maximum of 3
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1953 to 1977
Type of Methodology Used:Case-control
Sample Size (miles):3 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009