The SS180® is a truck mounted attenuator for use on stationary or moving shadow or support vehicles. It is tested to NCHRP Report 350 Test Level 3. The unit is comprised of two lightweight aluminum cartridges contained in a potentially reusable steel support frame, and a 180° tilt feature which folds at the center to stack the two cartridge sections on top of each other.* The SS180® is designed to help absorb rear-end impacts at speeds up to 62 mph (100 km/h) when impacted within NCHRP Report 350 crash test standards.

Product Inquiry


  • Short height while in storage mode ideal for garage storage and low overpasses.
  • Replaceable, energy absorbing cartridges.
  • Potentially reusable steel support frame.*
  • Designed to help minimize damage from low-speed nuisance hits up to 6 mph (10 km/h).
  • Vibration, corrosion, and water resistance tested.


*After an impact, the product must be inspected and evaluated per the direction of the specifying roadway authority. The ultimate decision on reusability rests with the specifying roadway authority and/or state DOT.

Assembly & Maintenance

  • Multiple attachment options for standard trucks.
  • Attaches to existing Safe-Stop TMA® mounts for standard and tailgate operations.







  • 2,080 lbs. (943 kg)
  • 7’ 9″ (2.36 m) Length from Back of Truck (Travel Position)
  • 7’ 9″ (2.36 m) Width
  • 6’ 10” (2.08 m) Height (Travel Position)
  • 12″ (30.5 cm) Road Clearance
  • 16,090 lbs. (7,300 kg) Minimum Support Vehicle Weight

Product Images

Product Documents

PI Sheet



SS180® (Model 9182) Product Description Assembly Manual
115358 SS180® 9180 Install-Operation
SS 180® Troubleshooting Guide
Safe-Stop 180 TMA (Model 9181) Installation/Operation
Safe-Stop 180 TMA (Model 9181) Quick-Mount Installation
Safe-Stop 180 TMA (Model 9182) Quick-Mount
Safe-Stop 180 TMA Bushing Replacement Instructions
Safe-Stop 180 TMA Model 9182 Improvements
SS180® 9181 Pump Conversion Instructions