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

 

 

Evaluations of Low Cost Safety Improvements Pooled Fund Study

 

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.

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.

Phase VI, the Pavement Safety Performance, is a retrospective study started in November 2012 and will be completed in February 2014. Eleven strategies are being evaluated for:

  • Asphalt; thin hot-mix asphalt overlay, chip seal, microsurfacing, ultra-thin bonded wearing course, open graded friction course, and slurry seal.
  • Concrete; diamond grinding, ultra-thin bonded wearing course, microsurfacing, grooving.
  • Everyday Counts 2; high friction surface treatment.

The Phase VII is a retrospective study. This study started in November 2012 and it is expected to be completed by February 2015. The following four strategies will be evaluated:

  1. Pedestrian signals, signs, markings, etc.
  2. Driver feedback signs.
  3. Active intersection conflict warning systems/dynamic signing.
  4. Pavement marking types and characteristics.

Phase VIII will be determined by Technical Advisory Committee (TAC) members in the Ninth Annual TAC Meeting, May of 2013.