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The Effectiveness of Wider Edge Line Pavement Markings. February 2012 Sponsored by: AGBMA. Wider Lines Synthesis, 2002. Included: US practices International practices Review of literature Suggestions for research. Terminology. Standard edge line width = 4 inch
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The Effectiveness of Wider Edge Line Pavement Markings February 2012 Sponsored by: AGBMA
Wider Lines Synthesis, 2002 • Included: • US practices • International practices • Review of literature • Suggestions for research
Terminology • Standard edge line width = 4 inch • The standard for over 60 years • Wider edge line width = 6 inches • A recently proven low-cost safety countermeasure
Adding a 4-inch Edge Line • Benefit/cost ratio of 60:1 (Miller)
New findings released in 2011 at June NCUTCD Safety Effects of Wider Edge Lines on Rural, Two-Lane Roads
Publications • FHWA Final Report • Submitted Dec 31, 2011 • In publication office • Journal Accident & Analysis Prevention • Paper accepted in January 2012 • Current in press
Summary of Safety Effects • Kansas from 2001-2007, almost 1300 miles • Michigan from 2001-2009, 787.8 miles • Illinois from 2001-2006, 287 miles
Comparative B/C Analysis • Used disaggregated fatal and injury crash reduction findings from Kansas data • Used crash cost values from NHTSA inflated to 2011 dollars • Assumed 22 of injuries were disabling injuries and 78 were minor injuries • Assumed waterborne paint: • $0.15 per foot for 6-in markings • 2 year service life
Questions Paul J Carlson, Ph.D., P.E. Texas Transportation Institute 979-845-1728 paul-carlson@tamu.edu