Trinity Highway MATT, Assembly Manual

Page: 9 / 44

TrinityHighway.com
February 2022
Site Preparation
The MATT™ has a system length of 34’-4 1/2” [10.477 m], long and is a tangent, 31” [787mm] (+1” -0”) [+25 mm, -0 mm]
high, double-sided, re-directive/gating and energy absorbing attenuator/end terminal available for use with various
longitudinal highway barriers, in either unidirectional or bidirectional traffic applications.
It may be specified for use by the state/specifying agency in conjunction with strong post W-beam guardrail systems on
the NHS or other roadway. The decision to specify the MATT™ for a particular project is the responsibility of the
state/specifying agency design engineer who must ensure that the most appropriate end treatment has been selected
for the specific site conditions.
The MATT™ is designed to be attached directly to double sided strong post W-beam guardrail systems that have been
accepted under MASH or NCHRP Report 350 crash test criteria that utilize 8” [200 mm] offset blocks.
IMPORTANT: The MATT™ must not be attached directly to a weak post W-beam
guardrail system without an approved weak-post-to-strong-post transition plus a
minimum of 12’-6” [3.810 m] strong post W-beam guardrail with 6’-3” [1.905 m] post
spacing. The 12’-6” [3.810 m] strong post W-beam guardrail must be placed between
the MATT™ and the weak-post- to-strong-post transition.
IMPORTANT: Under NO circumstances shall the rail within the MATT™ be curved,
between Post 1 and Post 6. Ensure all MATT™ post spacings are 6’-3” [1.905 m] on
center.
IMPORTANT: When used with rigid barriers, (i.e. concrete barrier, wall or bridge pier) a
semi to rigid barrier transition will be required (see state/specifying agency standards).
IMPORTANT: Ensure the state/specifying agency standard transition is used when
connecting the MATT™ to a system other than double sided, 31” [787 mm] high MGS with 8”
[200 mm] offset blocks.
IMPORTANT: Ensure that the MATT™ application conforms to the AASHTO Roadside
Design Guide, current edition to include appropriate grading details.
IMPORTANT: Trinity Highway does not direct grading. Proper site grading must be
accomplished before assembly of the MATT™ in accordance with local guidelines OR
the AASHTO Roadside Design Guide (see Appendix A and B), whichever is more
stringent. Failure to follow this warning could result in serious injury or death in the
event of a vehicle impact with the system.
IMPORTANT: The Beginning Length of Need (“BLON”) for the MATT™
was established
during MASH Test 3-35 at Post 3, which is 12’-6” [3.810 m] from Post 1.
IMPORTANT: Only 8” [200 mm] composite offset blocks can be used at Post 6 and only
the supplied special MATT™ spacers/double spacers at all other post locations.
MATT was tested to MASH-2nd Edition (2016), with 2020 Errata Test Level 3 criteria and
may be used in Test Level 1, Test Level 2, and Test Level 3 applications – when installed
at the full Test Level 3 system length of 34’ 4-1/2” [10.477 m].