SS90™ HD – Truck Mounted Attenuator (TMA)

The SS90HD is a heavy duty, potentially reusable truck mounted attenuator (TMA) available for use on stationary or moving shadow/support vehicles. This TMA has passed all mandatory and optional testing and is NCHRP Report 350 Test Level 3 compliant. Additionally, the SS90HD has passed the UK TD 49, 110 km/h (68 mph) test.The unit is comprised of two light-weight aluminum cartridges contained in a potentially reusable galvanized support frame. The SS90HD helps to absorb rear-end impacts at speeds up to 62 mph (100 km/h) when impacted according to NCHRP350 crash test standards.


  • Galvanized, potentially reusable coated systems. Black and yellow powder coated systems available upon request.
  • Replaceable energy absorbing cartridges.
  • High temperature rated, powerful hydraulic system quickly lowers and raises TMA for storage and transport.
  • Accessible hydraulic pump and reservoir promotes easy inspection and maintenance.
  • Custom lighting systems available in 12V, 24V, Incadescent or LED systems. Easy cable-routing and mounting locations ensure quick assembly.
  • “Push-to-activate” function raises and lowers unit. An alert buzzer sounds when unit is not fully deployed or in vertical position. In-cab controls also available.
  • Can withstand typical low-speed nuisance hits up to 6 mph (10 km/h).

Installation and Repair Advantages

  • Simple attachment options mount to standard truck.
  • Mounting options include standard and tailgate mount.
  • Hand crank jacks and swivel casters allow for easy stable mounting, dismounting and moving for storage.


  • 13’2” (3.98m) length from back of truck
  • 93” (2.36m) wide – 1996 lbs (906 kg)
  • 12” (3055 mm) road clearance
  • 16,090 lbs (7300 kg) minimum support vehicle weight
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