CMF / CRF Details

CMF ID: 6842

Increase pavement marking retroreflectivity

Description: Increase pavement marking retroreflectivity from X to Y mcd/m2/lx

Prior Condition:  The same minimum in-service level for both white and yellow markings: 175 mcd/m2/lx

Category: Delineation

Study: Nighttime Safety and Pavement Marking Retroreflectivity on Two-Lane Highways: Revisited with North Carolina Data, Carlson et al., 2015

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:60
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:14.8  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Nighttime
Crash Severity:All
Roadway Types:Not specified
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 30 to Maximum of 13000 Annual Average Daily Traffic (AADT)
Average Traffic Volume:2811 Annual Average Daily Traffic (AADT)
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:2001 to 2009
Type of Methodology Used:Regression cross-section
Sample Size (crashes):85 crashes
Sample Size (sites):234 sites
Sample Size (miles):616.8 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Nov 01, 2015
Comments:This CMF applies to the scenario where retroreflectivity of the White edge lines and Yellow center line increase from 175 mcd/m2/lx and 175 mcd/m2/lx to 350 mcd/m2/lx and 225 mcd/m2/lx, respectively.