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Florida Department of Transportation T EMPORARY C RASH C USHIONS FDOT Contacts: District One Construction Marshall Douberley 863-519-2382 marshall.douberley.

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Presentation on theme: "Florida Department of Transportation T EMPORARY C RASH C USHIONS FDOT Contacts: District One Construction Marshall Douberley 863-519-2382 marshall.douberley."— Presentation transcript:

1 Florida Department of Transportation T EMPORARY C RASH C USHIONS FDOT Contacts: District One Construction Marshall Douberley Earl Taylor FDOT Contacts: District One Construction Marshall Douberley Earl Taylor

2 T EMPORARY C RASH C USHIONS What is a crash cushion? Crash cushions are protective systems that prevent errant vehicles from impacting obstacles by either smoothly decelerating the vehicle to a stop when it hits head-on or by redirecting the vehicle away from the obstacle in glancing impacts. Two types of crash cushions are used in work zones: stationary and mobile, the latter of which are commonly called truck- or trailer-mounted attenuators (TMAs). Referenced: AASHTO RSDG

3 T EMPORARY C RASH C USHIONS Crash Cushions  Temporary/Permanent  Attached to rigid barriers  Median Barriers  Roadside Barriers  Bridge Railing  Used in either median or roadside application 3

4 T EMPORARY C RASH C USHIONS Test Vehicles NCHRP (National Cooperative Highway Research Program) 350: 820C and 2000P MASH (Manual On Assessing Safety Hardware): 1100C and 2270P Includes Passenger Cars Of All Sizes, Sport/Utility Vehicles, Mini-Vans, Vans and Pick-up Trucks NCHRP 350 = 820C (1800 lb.) Passenger 20 deg. MASH = 1100C ( deg. NCHRP 350 = 2000P (4400 lb.) Pickup 25 deg. MASH = 2270P ( deg. TL-2 tested at 70 km/h (44 mph) TL-3 tested at 100 km/h (62 mph) 4

5 T EMPORARY C RASH C USHIONS FHWA Criteria Crash Cushions meet NCHRP 350/ MASH - Test Level 3 (TL-3) Cost Effectiveness m#btcc2 5 What TEST LEVEL is used for a 70 mph facility?

6 T EMPORARY C RASH C USHIONS FDOT Criteria  VENDOR DRAWINGS TL-2 (45 mph or less) TL-3 (50 mph or greater)  SPEEDS Interpolating at 5 mph increments Extrapolating for speeds above 60 mph is no longer allowed 6

7 T EMPORARY C RASH C USHIONS FDOT Design Requirements Station/Offset Type of Crash Cushion (TL-2 or TL-3) Speed Width - Narrow vs. Wide Length Restrictions MOT Phase (Temporary) 7

8 T EMPORARY C RASH C USHIONS 8

9 WIDTH 9 Hazard Width

10 T EMPORARY C RASH C USHIONS LENGTH 10 System Length

11 T EMPORARY C RASH C USHIONS LENGTH RESTRICTIONS 11 System Length

12 Inertial Redirective 12 T EMPORARY C RASH C USHIONS

13 13 Barrier Wall End Anchor Plates T EMPORARY C RASH C USHIONS

14 14 Barrier Wall End Anchor Plates Where barrier wall end units are not anchored, 2 and ½ wall units (min.) are required beyond the length of barrier need for wall end anchorage T EMPORARY C RASH C USHIONS

15 15 Crash Cushion Attached to Barrier Systems T EMPORARY C RASH C USHIONS Crash Cushion

16 T EMPORARY C RASH C USHIONS 16

17 T EMPORARY C RASH C USHIONS 17 TAU II

18 T EMPORARY C RASH C USHIONS 18 TAU II

19 T EMPORARY C RASH C USHIONS 19 X-TENUATOR

20 T EMPORARY C RASH C USHIONS 20 Xtenuater

21 T EMPORARY C RASH C USHIONS 21

22 T EMPORARY C RASH C USHIONS 22 QUADGUARD

23 T EMPORARY C RASH C USHIONS 23 QUADGUARD

24 T EMPORARY C RASH C USHIONS 24 QUADGUARD ELITE

25 T EMPORARY C RASH C USHIONS 25 QUADGUARD ELITE

26 T EMPORARY C RASH C USHIONS 26 QUADGUARD II

27 T EMPORARY C RASH C USHIONS 27 QUADGUARD II

28 T EMPORARY C RASH C USHIONS 28 React 350 II

29 T EMPORARY C RASH C USHIONS 29 React 350 II

30 T EMPORARY C RASH C USHIONS 30 Quest

31 T EMPORARY C RASH C USHIONS 31 Quest

32 T EMPORARY C RASH C USHIONS 32 Heart

33 T EMPORARY C RASH C USHIONS 33 Heart

34 T EMPORARY C RASH C USHIONS 34

35 T EMPORARY C RASH C USHIONS 35 TRACC

36 T EMPORARY C RASH C USHIONS 36 TRACC

37 T EMPORARY C RASH C USHIONS 37

38 T EMPORARY C RASH C USHIONS 38 SCI

39 T EMPORARY C RASH C USHIONS 39 SCI

40 40 T RUCK /T RAILER M OUNTED A TTENUATORS (TMA’S) Truck or Trailer Mounted Listed on QPL Indexes 607 & 619 Mounted by Manufacturers Recommendations

41 41 T EMPORARY C RASH C USHIONS

42 42 Pay Item T EMPORARY C RASH C USHIONS

43 43 Plans : T EMPORARY C RASH C USHIONS Summary of Temporary Crash Cushions MOT PhaseStation Offset (feet) Side Work Zone Speed (mph) Type (TL-2 or TL-3) Width of hazard (inches) Length Restrictions (feet) Phase Rt.55TL-324 inchN/A Phase Lt.45TL-248 inch14

44 44 Specifications: Temporary Crash Cushion: Furnish, install, maintain and subsequently remove temporary crash cushions in accordance with the details and notes shown in the plans, the Design Standards, and requirements of the pre-approved alternatives listed on the QPL. Maintain the crash cushions until their authorized removal. Repair all attachment scars to permanent structures and pavements after crash cushion removal. Make necessary repairs due to defective material, work, or Contractor operations at no cost to the Department. Restore crash cushions damaged by the traveling public within 24 hours after notification as authorized by the Engineer. T EMPORARY C RASH C USHIONS

45 Q UESTIONS ???????????????? T EMPORARY C RASH C USHIONS


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