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Temporary Barriers and Crash Cushions

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  1. FDOT Contacts: Construction Stefanie Maxwell 850-414-4313 Stefanie.maxwell@dot.state.fl.us Design Ezzeldin Benghuzzi 850-414-4352 ezzeldin.benghuzzi @dot.state.fl.us Temporary Barriers and Crash Cushions Florida Department of Transportation

  2. Temporary Barriers Precast Concrete Temporary Barrier Temporary Low Profile Barrier Temporary Water Filled Barriers Temporary Guardrail

  3. Precast Concrete 3 Types Precast Concrete Temporary Barriers

  4. Index 415 Barrier Wall Temporary Barriers 415

  5. Index 415 Barrier Wall Temporary Barriers 415 Index 415 units constructed prior to October 1, 2002 may be used until September 30, 2012 THROUGH JUNE 30, 2012 LETTING with usage of ‘FDOT Snake Pin’ Interconnection

  6. JJ Hook See QPL for vendor drawings Index 415 - JJ Hook Temporary Barriers Temporary Barriers

  7. Index 415 and JJ Hook

  8. Index 415 and JJ Hook

  9. Index 415 and JJ Hook

  10. Index 415 and JJ Hook • Transitions • Required Between Other Types of Barriers

  11. Index 415 and JJ Hook See Index 415 Sheet 1 • Varies on Use, Location and Speed Deflection Space

  12. Index 415 and JJ Hook Traffic Side Deflection Space and Offset

  13. Index 415 and JJ Hook Traffic Side Deflection When Shielding Design Speed Space 45 mph or Less 2’ Above Ground Hazards Deflection Space 50 mph and Greater 4’ 2’ 45 mph or Less Drop off Hazards 50 mph and Greater: 2’ a. Drop off 4’ or less, no traffic below b. All drop off conditions other than ‘a.’ 4’ • Deflection Space Based On Installation On An Asphalt Or Concrete Surface.

  14. Index 415 and JJ Hook Offset Traffic Side Traffic Side Deflection Space and Offset Design Speed Offset to Travel way Used As Median Barrier Separating Opposing Traffic Lanes 0 min., 2’ preferred 45 mph or Less 50 mph and Greater 2’

  15. Index 414 – Type K Temporary Barriers Temporary Barriers Type K 12’-6” Segment Length Only Type K barrier is approved for use on bridges

  16. Type K

  17. Type K

  18. Type K

  19. Type K • Required Between Type K Freestanding, Bolted, Staked and Back Filled • Required Between Other Types of Barriers • Transitions

  20. Type K Deflection Space

  21. Bolted Type K • See Index 414 - Sheet 5

  22. Type K • Staked • See Index 414 - Sheet 6

  23. Type K • Free Standing • Roadway • See Index 414 -Sheet 6

  24. Type K • Free Standing • Bridge • See Index 414 -Sheet 6

  25. Type K • Free Standing • Roadway Median • See Index 414 -Sheet 7

  26. Barrier Terms Work Area Approach End – The portion of a barrier system exposed to approaching traffic.

  27. Barrier Terms Work Area Trailing End – Downstream end of a barrier system, not exposed to approaching Traffic.

  28. Barrier Terms Work Area Unidirectional – Exposed to traffic approaching from one direction only.

  29. Barrier Terms Work Area Bidirectional – Exposed to traffic approaching from opposing directions

  30. Barrier Terms Work Area Point of Departure - A point on the edge of a lane at which an errant vehicle leaving the lane will likely impact the leading face of a hazard or area of concern.

  31. Barrier Terms Work Area Departure Line - A line extending from the Point of Departure to the back of a hazard or Clear Zone

  32. Barrier Terms Work Area Departure Rate - The rate at which the Departure Line leaves the roadway and extends to the back of a hazard or CZ. 1:16 or 1:13 1:16 or 1:13 1:16 for speeds 45 mph or less 1:13 for speeds 50 mph or greater

  33. Barrier Terms Work Area Work Area INSIDE Clear Zone Limit use the Back of Hazard or Back of Work Area Inside Clear Zone Clear Zone Limit

  34. Barrier Terms Work Area extends OUTSIDE Clear Zone Limit use the Clear Zone Limit Distance Work Area Clear Zone Limit

  35. Barrier Terms Work Area Beginning Length of Need- The point at which a barrier intersects the Departure Line establishes the Beginning of the Length of Need

  36. Barrier Terms Work Area Length of Advancement (X) – The distance a longitudinal barrier must be extended in advance of an area of concern in order to adequately shield the hazard. X

  37. Barrier Terms(Length of Advancement) X=256′ D=18 ′ d=2 ′ Example for 45 mph with CZ of 18’ with Barrier set at 2’ from Edge of Pavement X = 16 (18-2) X = 256’

  38. Barrier Terms Work Area Length Of Need Unidirectional – Barrier needed is from the approach departure line to the trailing departure line. Length of Barrier Wall Needed

  39. Barrier Terms Work Area Length Of Need Bidirectional – Barrier needed is from the approach departure line to the trailing departure line Length of Barrier Wall Needed

  40. Barrier Wall Inspection • Quality Standards for • Work Zone Traffic Control • Devices • Illinois Department of Transportation • ATSSA American Traffic Safety Services Association

  41. Barrier Wall Inspection • American Traffic Safety Services Association (ATSSA)

  42. Barrier Wall Inspection

  43. Barrier Wall Inspection

  44. Barrier Wall Inspection

  45. Low Profile Barrier Intended for use in Urban Areas where sight distance for side streets and driveways may be a problem.

  46. Low Profile Barrier

  47. Low Profile Barrier

  48. Low Profile Barrier

  49. Low Profile Barrier

  50. Low Profile Barrier • Deflection • Space & Offset • Deflection Space - 9 inch min • Approach End Offset – 6 foot min