Session 3 Grading Requirements for Guardrail End Treatments.

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Presentation transcript:

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

Advanced grading if not properly done can cause a rollover

Adjacent grading

KY Example - Good Grading, Guardrail Installed for Box Culvert But Pre Pass Box & Pole Only 95’

Adjacent grading if not properly done can cause a rollover

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

Run out grading

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

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

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’

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

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

Q & A Time 3. 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