Work Area Protection | Attenuators
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The only fully redirective attenuator tested to MASH and NCHRP 350 with no changes!

The World’s Only Speed-Dependent Crash Attenuators


The Smart Cushion® crash attenuator is a revolutionary, speed-dependent product that varies stopping resistance during an impact. The Smart Cushion® crash attenuator allows lighter and slower-moving vehicles to have longer ridedown distances and lower ridedown g-forces.

Unlike fixed-resistance attenuators, the Smart Cushion® attenuator does not reach maximum stopping resistance unless a vehicle is traveling at the maximum design speed. This fully re-directive, non-gating, bidirectional, impact attenuator was designed for maximum safety and reusability, as well as outstanding durability before, during and after an impact. 

The Smart Cushion® is the only attenuator with a reverse-tapered design to eliminate side panel stress during a collapse. It also has an extremely low angle of exit on side impacts to keep vehicles from rebounding back into traffic and causing secondary accidents.

How It Works

The hydraulic porting of the attenuator ensures that the proper resistance is used to stop the vehicle before it reaches the end of the cushion’s usable length.The Smart Cushion® was specifically designed for durability and resetability to enable resets to be performed in less than 30 minutes.

A unique attribute of the Smart Cushion® is that side Impacts on the road rarely require any repairs. This eliminates mobilization, repair labor and parts after side impacts which average of 30% – 40% of the incidents depending on the roadway geometrics.

After an impact, the cushion requires a dual-stage pull-out with the replacement of two 1/4″ shear bolts. The crash attenuator requires a minimal inventory of spare parts because of the new side panels’ durability and the normal requirement of only two shear bolts on the frontal impact reset. Minimal damage means quick resetting and reduced worker exposure to traffic, as well as lower costs for traffic control, replacement parts and labor.

Ready To Install

Smart Cushion® attenuators come fully assembled for a pick-and-set install. A typical installation can be performed in less than 90 minutes.

The Smart Cushion® is self-supporting and requires no additional support for permanent or temporary construction applications.

NCHRP 350 Test Results

All NCHRP 350 tests were performed on the same unit over four consecutive days. All tests showed outstanding results for ridedown g-forces and low angle of exit. In fact, the small car g-forces of 9.8 on test 3.30 has never been matched which is extremely important considering this is now a MASH unit. There were no replacement parts required prior to the next test except for shear bolts.

SCI Crash Test NCHRP 350 Test Videos

Test #3-39 NCHRP 350 Video

Repair Costs

Based on NCHRP 350 test results, the SCI100GM required the following parts and labor:

NCHRP 350 Test Levels Available

The SCI70GM is a Test Level 2 attenuator and the SCI100GM is a Test Level 3 attenuator. Both attenuators can protect a wide range of hazards including but not limited to bridges, median barriers and highway signs.

MASH Test Results

All MASH tests were performed including the optional midsize car test using an independent accredited testing facility. Once again, the Smart Cushion established records for ridedown g-forces for small vehicles just like it did with NCHRP 350.

SCI MASH Crash Testing Video

Repair Costs

Based on MASH test results, the SCI100GM required the following parts and labor:

MASH Test Levels Available

The SCI100GM is a MASH and NCHRP 350 Test Level 3 attenuator.


Support Gussets

Gussets located behind the panels reduce gap formation and deformation to prevent snagging on reverse side impacts.

Stronger Side Panel

The panel is over 90% stronger than curved profiles. The profile allows the edges to be beveled, reducing the potential for snagging and damage on reverse direction impacts. The panel also smoothly redirects vehicles on side impacts. The side panel is fabricated from 10-gauge,0-ksi, minimum-yield steel with an ASTM A123 galvanized coating.

Cable & Cylinder System

This system allows longer ridedown distances for smaller vehicles, as well as smoother ridedown with lower g-forces for all vehicles. The cylinder’s hydraulic porting assures a controlled ridedown by applying the necessary resistance required based on the speed and mass of the vehicle.

Side Guide Design

This revolutionary design withstands side impacts with no damage.

Front Rollers

The roller guide design on the front sled produces a smooth, aligned collapse by reducing friction and binding.

Safety Benefits:

• Variable resistance (speed-dependent), not fixed resistance, provides consistent deceleration during ridedown.
• Longer ridedown distances and lower sustained g-forces for lighter or slower-moving vehicles.
• Quick and easy resets for reduced worker exposure to traffic.
• Low angle of exit on side impacts to keep vehicle from rebounding back into traffic.
• No mobilization required after side impacts reduces public and worker exposure.

Cost Benefits:

• Few replacement parts requirement virtually eliminates spare parts inventory and parts costs.
• Thirty minute resets reduces labor and traffic control costs.
• The reverse-tapered design eliminates side panel stress on frontal impacts to reduce damage and system fatigue from multiple impacts.
• Life cycle cost savings increase dramatically as additional impacts occur.
• No damage on side impact combined with low cost on frontal impacts can save you 75% or more on costs including labor, mobilization and parts.
• Systems shipped from factory fully assembled reduce on-site labor.



Installation Video

Coming Soon

Resetting, Inspection & Repair Video


NHI Innovations Web Conference

NHI-TIG Severe Duty Crash Attenuator Webinar

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