CMF / CRF Details

CMF ID: 2435

Install new fluorescent curve signs or upgrade existing curve signs to fluorescent sheeting

Description: Enhancing delineation along curves by installing new or replacing existing warning signs, curve delineation signs, and/or post mounted delineators. Warning signs include curve ahead or suggested speed limit and curve delineation signs include chevrons and horizontal arrows.

Prior Condition: No sign or sign without fluorescent sheeting

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: 0.66
Adjusted Standard Error:
Unadjusted Standard Error: 0.115
Crash Reduction Factor (CRF)
Value: 34   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 11.5
Crash Type: Head on,Nighttime,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 895 to Maximum of 20479 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: 1997 to 2006
State: CT
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: