CMF / CRF Details

CMF ID: 6843

Increase pavement marking retroreflectivity

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

Prior Condition: Minimum in-service retroreflectivity for White edgeline: 250 mcd/m2/lx; for Yellow centerline: 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)
Value: 0.717
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 28.3   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
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
Municipality:
State: NC
Country: USA
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 250 mcd/m2/lx and 175 mcd/m2/lx to 500 mcd/m2/lx and 350 mcd/m2/lx, respectively.