CMF / CRF Details

CMF ID: 68

Changeable Curve Speed Warning signs


Prior Condition:  No Prior Condition(s)

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:1.38
Unadjusted Standard Error:0.46
Crash Reduction Factor (CRF)
Value:2  (This value indicates a decrease in crashes)
Adjusted Standard Error:138
Unadjusted Standard Error:46
Crash Type:All
Crash Severity:O (property damage only)
Roadway Types:Principal Arterial Other
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
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:
Type of Methodology Used:Simple before/after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009