Grand Prairie (TX) Retrofits Engines with Crash Attenuators

Grand Prairie Fire Department has retrofitted its engines with crash attenuators.
Photo/Grand Prairie FD
Photo/Grand Prairie FD

The Grand Prairie (TX) Fire Department has retrofitted two reserve engines with TrafFix Devices Scorpion Crash Attenuators to protect personnel working at incident scenes and reduce injuries/fatalities for occupants in a vehicle that collides with stationary emergency apparatus serving as “blocking”/protection apparatus at a scene.

The Scorpion II Truck Mounted Attenuator (TMA) is a mobile crash cushion attached to the rear of a support vehicle’s frame. It can be used on moving “shadow” apparatus, on stationary “block” vehicles (engines), or on advanced warning vehicles deployed “upstream” of a moving or stationary operation.


When impacted, the Scorpion’s modular design crushes in progressive stages, which reduces the impact forces on the vehicles occupants and results in lower repair costs and easy parts replacement (See photo series).

Photos/TrafFix Devices

The curved side rails are made from corrosion resistant aluminum tubes and offer full width impact protection along the entire length of the Scorpion II by safely redirecting the impacting vehicle away from the deadly “coffin corners” at the rear of the truck. Unlike the Scorpion II, most other manufacturers Crash Attenuator models have little or no side-angle impact protection.

The photos shown here show “Scorpion 3,” one of two identical Grand Prairie Fire Dept. reserve engines outfitted with the Scorpion devices. One of these engines is always in service with an assigned full-time engineer driver/engineer so it can respond immediately to a dangerous traffic incident scene. The engines’ pump and water tank are fully functional, so they can serve as more than just a scene safety “blocker” engine.

The two buffer engines are dedicated to Dallas Fire-Rescue Officer William “Scott” Tanksley and Lubbock (TX) Fire Dept. firefighter/paramedic Eric Hill.

Tanksley was killed on February 10, 2014, when he was hit by a car and thrown from an icy highway overpass while working an accident scene.

Hill was struck and killed along with police officer Nicholas Reyna while working at the scene of an icy accident scene on January 11, 2020. A second firefighter was hospitalized in critical condition following the incident on Interstate 27 in Lubbock. The emergency responders arrived at the scene of a single-vehicle accident. While they were there, a second vehicle towing a trailer crossed the median about 25 yards from the first accident. A third vehicle then crossed and struck the two firefighters and officer Reyna.

The TMA’s integrated lighting consists of LED brake, directional, signal and running lights for enhancement of advanced warning to drivers.

The TMA is tested, passed and eligible to MASH TL-3 (62.5 mph / 100 kph). It can be used on support vehicles with a minimum actual/curb weight of 15,000 lbs. (6,804 kg) with no upper weight limit (infinite weight).

The Scorpion II TMA consists of three main components: Strut, Cartridge, and backup/diaphragm frames. The Strut and Cartridge are the energy attenuation components.

The Strut is positioned nearest to the support vehicle and the Cartridge is positioned furthest away from the support vehicle. The Cartridge is typically the first component impacted by an errant vehicle.

The Strut consists of four outboard convex aluminum tubes (two on each side) forming an aluminum structural weldment. The aluminum structural weldments bolt to a structural steel diaphragm/backup frame.

The TMA can be rotated in a double 90°- fold position over the support vehicles bed with a stored height of less than 12′ 5″ (3.8 m).

Its overall dimension of 12.94 ft. (3.9 m) × 8.0 ft (2.4 m) × 2.0 ft (0.6 m) and has a ground clearance of 12″ ± 1″ (305 mm ± 25.4 mm) when deployed in the horizontal (down) operating position.

When fully deployed, the Scorpion II TMA is only 13′ (4 m) in length, compared to other manufacturers units which are over 19′ (5.8 m), thus giving the Scorpion II the shortest overall length of any MASH Eligible Truck Mounted Attenuator on the market. This shorter length reduces incidental impacts and repair costs while still providing the best safety and reliability you have come to expect from the Scorpion line of crash attenuators.

The Scorpion II TMA is the world’s first Truck Mounted Attenuator eligible for MASH, TL-3 tested at 62.5 mph (100 kph); see FHWA Eligibility Letter CC-132 for details.

The Scorpion II TMA is compatible with the Doctor Air Brake® automatic braking system that instantly locks the brakes of the host vehicle upon impact, further protecting the driver of the TMA truck, occupants of the impacting vehicle, and any bystanders or workers near the crash.

In 2016, The Dallas County Sheriff’s Dept. purchased two Scorpion Trucks and stationed them at facilities near interstates 45 and 20, and in downtown Dallas, ready to roll when needed at emergency scenes.

Photo/Dallas County Sheriff’s Dept.

TrafFix Devices Website

Operational Videos

Actual Images of Impacted Scorpion II TMAs

Separate Trailer model

Specifications – Scorpion Model C TL-3

The Scorpion TMA Model C folds up and over the bed of vehicles/apparatus. The Model C has a compact design and balanced weight distribution that makes it ideal for high-speed / highway travel. The Scorpion TMA Model C provides TL-3 impact protection. Side mounts are also available.


1,975 lbs. (900kg)


Travel/Storage: 2′ 5″

Deployed: 12′ 10″

Width 8′


Travel/Storage: 10′ 6″

Deployed: 12″ ± 1″

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