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Limitations and Warnings
The Alpha 70K TMA (Truck Mounted Attenuator) has been tested and evaluated per the
recommendations of the national Cooperative Highway Research Program (NCHRP) report
350. The Alpha 70K TMA, as currently designed, is capable of, decelerating and stopping light
and heavy weight vehicles (820 and 2000 kg [1,808 and 4,410 lb.]) when the rear of the
Cartridge is impacted head-on at 70 km/h [43 mph] within the above referenced NCHRP criteria.
To achieve optimum impact performance, the Alpha 70k TMA must be mounted to a truck with a
traveling weight of 5000 – 12,000 kg [11,025 - 26,460 lbs.] gross vehicle weight rating (actual
weight should not exceed 9000 kg [19,845 lbs.]). The TMA Cartridge must be level and the
bottom of the Cartridge must be 305 mm ± 25 mm [12” ± 1”] above the ground.
Impacts that exceed the design capabilities described in this Manual (vehicle weight, speed and
impact angle) may not result in acceptable crash performance as described in NCHRP 350
relative to structural adequacy, occupant risk, and vehicle trajectory factors.
Follow all applicable DOT and/or applicable highway authority plans and specifications and
other regulations regarding placement and use of TMA.
