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Evaluations of Low Cost Safety Improvements Pooled Fund Study

 

Phases of the Evaluations of Low Cost Safety Improvements Pooled Fund Study (ELCSI–PFS) Phases

The Phase I study (retrospective) was competed for:

  1. Increased retroreflectivity of STOP signs.
  2. Flashing beacons at STOP-controlled intersections.
  3. STOP AHEAD pavement markings.
  4. Installing center two-way left-turn lanes on two-lane roads.

The Phase II study (retrospective) was completed for:

  1. Improved curve delineation.
  2. Offset improvements for left-turn lanes.
  3. Lane and shoulder width combinations on rural, two-lane, undivided roads.
  4. Advance street name signs.

The Phase III (build to evaluate) “before” evaluation is complete, and is currently in a data-collection period for “after” evaluation of:

  1. Surface friction treatment on curves.
  2. Surface friction treatment on ramps.
  3. In-lane pavement markings for curve warning.
  4. Larger chevrons.
  5. Edgeline rumble stripEs on curves.
  6. Red light indicator lights.

The Phase IV is complete. This phase was conducted for:

  1. Rural two-lane undivided roads: nighttime delineation for curves (three strategies).
  2. Rural traffic calming for small towns (three strategies).

Phase V is a prospective study and the “before” evaluation is complete. This study is currently in a data-collection period for “after” evaluation of:

  1. Combination of centerline and edgeline rumble strips.
  2. Combination of median barrier and rumble strips.
  3. Signalized intersection multicountermeasures.
  4. STOP-controlled intersection multicountermeasures.

The Phase VI, Pavement Safety Performance, is complete. Eleven strategies were evaluated for:

  • Asphalt Pavement

    1. Thin hot-mix asphalt overlay.
    2. Chip seal, microsurfacing.
    3. Ultra-thin bonded wearing course.
    4. Open-graded friction course.
    5. Slurry seal.

  • Concrete Pavement

    1. Diamond grinding.
    2. Ultra-thin bonded wearing course.
    3. Microsurfacing and grooving.

High-Friction Surface Treatment (HFST), the second phase of Every Day Counts (EDC2).

The Phase VII is a retrospective study. This study started in November 2012 and three of its four strategies are complete. The following are the four strategies of this phase:

  1. Pedestrian Countdown Signals (PCS).
  2. Continuous Green T-Intersection (completed December 2014).

 

The Phase VIII is a retrospective study. This study started in August 2013 and it is to be completed in 2015. The following five strategies will be evaluated: 

  1. Signalized Restricted crossing U-turn (RCUT).
  2. Flashing yellow arrows.   
  3. Access management. 
  4. Realignment of horizontal curvature.
  5. Profiled thermoplastic pavement markings.

NEW: Phase IX is a retrospective study and will start in June 2015. The study’s intent is to provide reliable crash modifications factors (CMFs) and Benefit to Cost Ratios (B/C) ratios for different types of High Friction Surface Treatments (HFST) and to recommend materials, specifications, applications, and where and under what conditions to use them to effectively reduce roadway departure crashes. This study will quantify HFST performance overtime to recommend HFS treatments for best performances with technical details, and will recommend a set of required tests with equipment for evaluation of HFS treatment surface characteristics and performance evaluation for practitioners use.

 

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