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NCHRP Project 17-35: Evaluation of Safety Strategies at Signalized Intersections

 

 

Evaluations of Low Cost Safety Improvements Pooled Fund Study

 

PPT version for Printing

Combination Centerline and Edgeline Rumble Strips

Header image – Picture shows series of three scenarios: a vehicle on a meandering road, safety personnel at work, and a car that is very badly damaged after it appears to have collided into a telephone pole.
 
Dr. Frank Gross, VHB

Overview

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

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)
View Alternative text
  • 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
  • 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

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
  • 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)

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
View Alternative text

Remaining Data Needs

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

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

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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