1. Session 3 Grading Requirements for Guardrail End Treatments

2. Recoverable Slope 4:1 or Flatter

3. Traversable Slope 3:1 to 4:1

4. Non-Traversable Critical Slope Steeper 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 Culvert But 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-004 Installation 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 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