Lane Departure Countermeasures

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Lane Departure Countermeasures
System-wide Solutions for Saving Lives

• Don Hillis, P.E.
• Director System Management
• Missouri Department of Transportation

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The Problem 1200 Fatalities

• Fatal Crash Locations are Random

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The Problem 1200 Fatalities

• Fatal Crash Types are NOT RANDOM

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Solution System Improvements

• Where does Missouri begin to address its
  32,000-mile system?

Major Minor Roads
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Solution 1
Smooth Roads Initiative
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Smooth Roads Initiative
OVERVIEW

• Funding Bond Issue
• Improve 2,000 miles of most heavily traveled
  roads
• 7 of state mileage
• 60 of annual VMT on these routes
• Projects Completed 2005-2006

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Smooth Roads Initiative
TREATMENTS

• New Roadway Surface
• Asphalt Overlay
• Concrete Diamond Grind
• 6 Edgelines Rumble Stripe (Epoxy)
• 6 Lane Lines 3M Waffle Tape
• Some wet-reflective

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Smooth Roads Initiative
TREATMENTS

• Delineate Everything
• Emergency Reference Markers
• Sign upgrades

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Solution 2
Better Roads, Brighter Future
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Better Roads, Brighter Future
OVERVIEW

• Existing district funds
• 2007-2011
• Next 3,000 miles
• Mostly Two-lane

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Better Roads, Brighter Future
TREATMENTS

• All major roads (5,000 mi) will have
• Minimum 4 feet paved shoulder
• Smooth driving surface
• Improved signing
• 1,000 miles will receive
• Edgeline Centerline rumble stripes

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Solution 3
Imbed Safety into MoDOT Policy
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Imbed Safety into Policy

• Rumble Stripes (Edgeline Centerline)
• All major roads
• All minor roads with crash history
• 6-inch Stripes
• All Edgeline
• Multi-lane skips
• Curve Speed Plaques
• Every Curve/Turn sign

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Solution 4
Median Cable Barrier
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Median Guard Cable

• 1999 - Spot Locations in St. Louis
• 2003 - System-wide Installation
• Criteria
• Interstates
• Severe Crash History

• Current Installations
• 250 miles installed to date
• Low High Tension

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Evaluation
Was this a good investment?
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Evaluation

• Effectiveness
• Does the treatment perform as intended?
• Safety Analysis
• Are we reducing crashes?
• Are we saving lives?

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Effectiveness Guard Cable

• Studied all reported cross-median crashes
• 1999-2005
• 1,400 crashes
• 95 Success Rate
• Vehicles did not enter opposing lanes

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Evaluation
Safety Analysis
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Safety Analysis Guard Cable
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Safety Analysis Guard Cable
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Safety Analysis
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Safety Analysis
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Questions?