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Manual TTMA-100K
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Introduction:
A Trailer truck mounted attenuator (TTMA) is an energy absorbing device attached to the rear of a
truck or utility vehicle. A TTMA is designed to provide a controlled stop of a vehicle impacting the
rear of the truck. TTMAs have been used since the mid- 1970's to reduce the severity of impacts
between errant motorists and slow moving or stopped shadow vehicles used to protect highway
maintenance workers.
The National Cooperative Highway Research Program Report 350 (NCHRP 350) specifically addresses
the performance requirements of TTMAs. The recommended tests to evaluate TTMA crash
performance are defined for two different Test Levels. The basic Test Level, TL-2, is conducted at a
nominal impact speed of 70 kph. TL-3 is the higher test level and is conducted at 100 kph.
This report presents the manual for the Verdegro TTMA, at the more demanding NCHRP 350 TL-3
test conditions.
The Verdegro TTMA 100K, in this manual called TTMA is a device with an optional framework for a
sign, eventually with LED arrow or LED display. The TTMA must be placed behind a supporting truck
with a minimum weight of 8.000 Kg and a maximum weight of 12.000kg
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for best performance
results. The crash cushion mounted on this TTMA is 100K, which means test with the TTMA were
done according TL-3 of the Report NCHRP-350.
The TTMA is amply equipped with features that promote safety. By inspect them, the quality,
efficiency and safety of the TTMA improved.
Check the condition of the TTMA daily before starting work on the base of the instructions. It is
strictly forbidden to use the TTMA when it is damaged, not maintained or inspected.
The Manufacturer reserves the right to the machine construction, parts and maintenance
instructions without notice.
This manual is only for the Verdegro TTMA-100K. Some drawings or colors in this manual can be
slightly different from the delivered model which should be recognized as a typical Verdegro TTMA -
100K.
Attention! Before maintenance or checks, disconnected the power!
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For some countries other specifications are mandatory. See chapter “supporting vehicle” for specifications.
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If you have a truck which is heavier, contact Verdegro or your distributor.
