CMF / CRF Details

CMF ID: 2437

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: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.94
Adjusted Standard Error:
Unadjusted Standard Error: 0.088
Crash Reduction Factor (CRF)
Value: 6   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 8.8
Applicability
Crash Type: Head on,Non-intersection,Run off road,Sideswipe
Crash Severity: All
Roadway Types: All
Number of Lanes: 2
Road Division Type: Undivided
Speed Limit:
Area Type: Rural
Traffic Volume: Minimum of 261 to Maximum of 14790 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day: All
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:
Comments: