The Safety Benefits of a Truck-Mounted Attenuator
A TMA is the last line of defense between live traffic and a work crew. Here is what it does in a crash and why it belongs on mobile and short-duration jobs.
A truck-mounted attenuator is a crash cushion on a truck. The truck parks as a shadow vehicle behind the crew, and if a driver fails to stop, the attenuator takes the impact instead of the workers. It is the piece of equipment that matters most on the day something goes wrong.
What happens in an impact
When an errant vehicle strikes the attenuator, the unit absorbs the crash energy and steers the vehicle away from the cab's coffin corner, the spot that would put the driver at greatest risk. A chassis rated around 26,000 lb GVWR or higher keeps the striking vehicle from wedging under the truck. The crew ahead stays protected because the truck, not a person, stops the vehicle.
Where a TMA earns its place
- Mobile operations like striping and sweeping that move down a road
- Short-duration lane closures where fixed barriers are impractical
- Any work zone where crews stand within reach of live traffic
- Highway speeds that call for a TL-3 rating
A TMA is mobile protection. It follows the crew, sets up in minutes, and delivers barrier-grade impact absorption without pouring a fixed installation.
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