CMF / CRF Details

CMF ID: 2440

Install chevron signs on horizontal curves

Description: Along a curve with a small radius, large deflection angle, available sight distance smaller than stopping sight distance, and superelevation smaller than demanded at design and operating speed.

Prior Condition:  No sign

Category: Signs

Study: Safety Evaluation of Improved Curve Delineation, Srinivasan et al., 2009

 
Star Quality Rating:5 Stars  [View score details]
Rating Points Total:140
Crash Modification Factor (CMF)
Value:0.78
Adjusted Standard Error:
Unadjusted Standard Error:0.101
Crash Reduction Factor (CRF)
Value:22  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:10.1
Applicability
Crash Type:Head on,Nighttime,Non-intersection,Run off road,Sideswipe
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
Traffic Volume:Minimum of 261 to Maximum of 14790 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day:Night
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:1993 to 2007
Municipality:
State:WA
Country:
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 01, 1970
Comments: