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Session 3 Grading Requirements for Guardrail End Treatments

Session 3 Grading Requirements for Guardrail End Treatments. Recoverable Slope 4:1 or Flatter. Traversable Slope 3:1 to 4:1. Non-Traversable Critical Slope Steeper than 3:1. Three Areas to Consider for Grading. Advanced Grading Adjacent Grading Run Out Grading. Advanced grading.

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Session 3 Grading Requirements for Guardrail End Treatments

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  1. Session 3Grading Requirements for Guardrail End Treatments

  2. Recoverable Slope 4:1 or Flatter

  3. Traversable Slope3:1 to 4:1

  4. Non-Traversable Critical SlopeSteeper than 3:1

  5. Three Areas to Consider for Grading • Advanced Grading • Adjacent Grading • Run Out Grading

  6. Advanced grading

  7. Advanced grading if not properly done can cause a rollover

  8. Adjacent grading

  9. KY Example - Good Grading, Guardrail Installed for Box CulvertBut Pre Pass Box & Pole Only 95’

  10. Adjacent grading if not properly done can cause a rollover

  11. Adjacent Grading – Not very High but 2:1 Slope Beside Pad

  12. Run out grading

  13. Run out grading if not properly done can cause a rollover or a collision with a fixed object

  14. Grading Requirements Standard Drawing RBI-004Installation of Guardrail End Treatment Type 1 2012 Std Draw shows 5’ of widening in the “Adjacent” area behind the guardrail

  15. Grading Type 4A End Treatment • Advanced: 10:1 front 4:1 side • Adjacent: 10:1 – 3 feet wide • Run Out: 4:1 desirable 3:1 Maximum Note: With the 2012 Std Drawings the 3’ “Adjacent” dimension will change to 5’

  16. Q & A Time 1. What are the Names for the 3 Areas of Grading? Advanced, Adjacent and Run Out

  17. 2. Why do we need to grade an area in front of an End Treatment so Flat? to ensure that a vehicle is stable at the moment of impact and that its suspension is neither extended nor compressed

  18. Q & A Time • Define: Recoverable Slope Traversable Slope Critical Slope • Recoverable Slope – 4:1 or Flatter • Traversable Slope – 4:1 to 3:1 • Critical Slope - Steeper than 3:1

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