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Low Cost Safety Improvements Pooled Fund Study

Low Cost Safety Improvements Pooled Fund Study. Combination Centerline and Edgeline Rumble Strips. Dr. Frank Gross, VHB. Overview. Background Missouri’s Program Status of Data Collection Remaining Data Needs Evaluation Considerations. Background. Singe-vehicle ROR Crashes

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Low Cost Safety Improvements Pooled Fund Study

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  1. Low Cost Safety Improvements Pooled Fund Study Combination Centerline and Edgeline Rumble Strips Dr. Frank Gross, VHB

  2. Overview • Background • Missouri’s Program • Status of Data Collection • Remaining Data Needs • Evaluation Considerations

  3. Background • Singe-vehicle ROR Crashes • 39 percent of all fatal crashes (FARS, 1999) • Included in Several NCHRP 500 Series Guidebooks • Run Off Road, Head-on, Heavy Trucks, and Horizontal Curves • Run-Off Road Guidebook • 3 Experimental Strategies • Edge line “profile marking” • Edge line rumble strips • Modified shoulder rumble strips (narrow or no paved shoulder) • Ranked 1st in Phase I • Low cost and short implementation timeframe (< 1 year)

  4. Background • Head-on Guidebook • Install centerline rumble strips • Tried strategy • Ranked 3rd in Phase II • Low cost • Short implementation timeframe (< 1 year) • Heavy Trucks and Horizontal Curve Guides • Shoulder and centerline rumble strips • Low to moderate costs • Short to medium implementation timeframe (1-2 years) • Heavy-vehicle drivers and horizontal curves

  5. Background • Dual Application • Combination of centerline and edge line rumble strips • Not included in NCHRP 500 Series • Identified by Technical Advisory Committee • NCHRP 17-32 Survey Results • Approximately 200 miles • 9 States • AZ, ID, KY, MO, OR, TX, UT, WA, WY

  6. Missouri DOT Program • Missouri DOT: Better Roads Brighter Future • Improve 85 percent of major route system in 5 years • Part of Program – Install Dual Rumble Strips • Two predominant roadway types • 4-lane divided expressways • 2-lane roadways. • Includes both rumble strips and stripes • Mostly stripes • Stripes are placed on the edge line • Posted speed limits 55-65 mph

  7. Missouri DOT Program • Proposed Strategy Sites for FY 2007-2011 • 1170 miles (170 sites for 2007) • 543 miles (75 sites for 2008) • 2351 miles (329 sites for 2009-2011) • Additional Improvements • Surface improvements (overlay) • Shoulder improvements (upgrade to 4’ where possible) • Others (sign upgrades where necessary)

  8. Status of Data Collection • Missouri • Planned installations • Those for SFY 2007 have begun • MO DOT provided roadway/traffic data • 2002 – 2005 • MO DOT provided crash database • 1997 – 2005

  9. Remaining Data Needs • MO Reference Sites • Sites planned for treatment in later years • Additional States • Proactive evaluation • States planning to install combination rumble strips

  10. Evaluation of Dual Application • Crash Based Evaluation in MO • Proactive before/after evaluation • Evaluate sample of installations • Disaggregate analysis • Roadway type • Night and weather conditions

  11. Evaluation Considerations • Disaggregate analysis • Functional class • Night and weather conditions • Including other states in evaluation • 4 States are Technical Advisory Committee Members

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