low cost safety improvements pooled fund study combination centerline and edgeline rumble strips dr....
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![Page 1: Low Cost Safety Improvements Pooled Fund Study Combination Centerline and Edgeline Rumble Strips Dr. Frank Gross, VHB](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bffc1a28abf838cc1b7b/html5/thumbnails/1.jpg)
Low Cost Safety Improvements Pooled Fund Study
Combination Centerline and Edgeline Rumble Strips
Dr. Frank Gross, VHB
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Overview
Background Missouri’s Program Status of Data Collection Remaining Data Needs Evaluation Considerations
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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)
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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
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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
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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
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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)
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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
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Remaining Data Needs
MO Reference Sites Sites planned for treatment in later years
Additional States Proactive evaluation States planning to install combination rumble
strips
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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
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Evaluation Considerations
Disaggregate analysis Functional class Night and weather conditions
Including other states in evaluation 4 States are Technical Advisory Committee
Members