the effectiveness of wider edge line pavement markings february 2012 sponsored by: agbma
TRANSCRIPT
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
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 EffectsCrash Type Percent ReductionTotal 15.0 – 30.1Fatal and Injury 15.4 – 37.7Day 12.0 – 29.1Night -2.4 – 30.7
• 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
Findings
Treatment B/C RatioWider Edge Lines $33 - $55 per $1Rumble Strips $37 - $46 per $1Chevrons $9 - $46 per $1RRPMs $13 per $1
QuestionsPaul J Carlson, Ph.D., P.E.Texas Transportation [email protected]