Barriers and Crash Cushions - Florida Department of Transportation

Report
FDOT Contacts:
District One
Construction
Marshall Douberley
863-519-2382
marshall.douberley
@dot.state.fl.us
Earl Taylor
863-519-2231
earl.taylor
@dot.state.fl.us
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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 2004
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Crash Cushions
 Temporary/Permanent
 Attached to rigid barriers
 Median Barriers
 Roadside Barriers
 Bridge Railing
 Used in either median or roadside application
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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
TL-2 tested at 70 km/h (44 mph)
TL-3 tested at 100 km/h (62 mph)
NCHRP 350 = 820C (1800 lb.) Passenger Car @ 20 deg.
MASH = 1100C (2420 lb.) @ 25 deg.
NCHRP 350 = 2000P (4400 lb.) Pickup Truck @ 25 deg.
MASH = 2270P (5000 lb.) @ 25 deg.
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What TEST LEVEL is used for a 70 mph facility?
FHWA Criteria
•Crash Cushions meet NCHRP 350/ MASH - Test Level 3 (TL-3)
•Cost Effectiveness
http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/qa_bttabr.cf
m#btcc2
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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
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FDOT Design Requirements
• Station/Offset
• Type of Crash Cushion (TL-2 or TL-3)
• Speed
• Width - Narrow vs. Wide
• Length Restrictions
• MOT Phase (Temporary)
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Hazard Width
WIDTH
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LENGTH
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LENGTH RESTRICTIONS
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Redirective
Inertial
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Barrier Wall End
Anchor Plates
Redirective crash cushions are the principle
device to shield approach ends of barrier wall
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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
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Crash Cushion Attached to Barrier Systems
Crash Cushion
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TAU II
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TAU II
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X-TENUATOR
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Xtenuater
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QUADGUARD
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QUADGUARD
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QUADGUARD ELITE
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QUADGUARD ELITE
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QUADGUARD II
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QUADGUARD II
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React 350 II
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React 350 II
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Quest
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Quest
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Heart
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Heart
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TRACC
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TRACC
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SCI
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SCI
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T RUCK /T RAILER M OUNTED
ATTENUATORS (TMA’S)
Truck or Trailer Mounted
Listed on QPL
Indexes
607 & 619
Mounted by
Manufacturers
Recommendations
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Pay Item
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Plans :
Summary of Temporary Crash Cushions
Work
MOT Phase
Station
Offset
(feet)
Zone
Type
Speed
(TL-2 or TL-3)
Side
Width of hazard
(inches)
Length
Restrictions
(feet)
(mph)
Phase 1
122+90
16
Rt.
55
TL-3
24 inch
N/A
Phase 2
145+27
16
Lt.
45
TL-2
48 inch
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Specifications:
102-9.6 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.
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Q UESTIONS ????????????????

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