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Session 4

Session 4. Length of Need (LON). Session 4 Outcomes. Define LON and its Basis Evaluate Examples of Field Installations Apply a Field Procedure to Check LON Adequacy. Length of Need (LON) Theory. Unknown. Edge of Traveled Way. Distribution of Runout Distances.

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Session 4

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  1. Session 4 Length of Need (LON)

  2. Session 4 Outcomes • Define LON and its Basis • Evaluate Examples of Field Installations • Apply a Field Procedure to Check LON Adequacy

  3. Length of Need (LON) Theory Unknown Edge of Traveled Way

  4. Distribution of Runout Distances

  5. Length of Need (LON)Definition The amount of (fully effective) barrier needed IN ADVANCE OF the hazard

  6. Graphical Definition of LON LENGTH OF NEED

  7. Beginning of BIG hole

  8. 4-9

  9. 4-10

  10. IF YOU KNOW THE OFFSET OF THE BARRIER FROM THE EOTW AT THE END OF THE BARRIER, YOU CAN SUBTRACT THE OFFSET FROM “D” AND MULTIPLY THE DIFFERENCE BY 15 TO CHECK THE LON 4-11

  11. Session 4 Review What is the Length of Need (LON) of a barrier? • The amount of barrier needed in advance of the hazard • The total length of barrier at the hazard • The time needed to adequately construct the barrier • Always 75 feet

  12. Session 4 Review The basic principle for determining the LON by the AASHTO procedure is Angle of Departure. • True • False

  13. Session 4 Outcomes • Define LON and its Basis • Evaluate Examples of Field Installations • Apply a Field Procedure to Check LON Adequacy

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