www.highwayguardrail.com 11 Revised: October 5, 2009
SITE PREPARATION
When the Guardrail is installed in-line with edge of the shoulder (without
any offset), a 25:1 or flatter straight flare over the length of the systems
can be used to position the ET-PLUS™ Extruder (Head) further away
from the edge of the shoulder. Minor site grading may be necessary for
installations beyond the edge of the shoulder, for the proper placement of
the steel tubes and the CRT posts. Use the state/specifying agency’s
standard specifications and drawings for the site grading. Trinity does not
direct grading. Complete all grading before the start of the installation of
the ET-PLUS™ systems. See INSTALLATION OF THE ET-PLUS™
SYSTEMS ON A CURVE section for the layout of the ET-PLUS™
systems on a curve.
WARNING: Ensure that there is proper site grading for tube and
post placement, as dictated by the state/specifying agency,
pursuant to FHWA acceptance. Failure to follow this warning
could result in serious injury or death in the event of a collision.
INSTALLATION
WARNING: Ensure that this installation conforms with the
guidance provided by the AASHTO Roadside Design Guide,
including, but not limited to, those regarding placement on curbs.
Failure to follow this warning could result in serious injury or death
in the event of a collision.
For installation of the ET-PLUS™
systems, see POST INSTALLATION
section. If the systems are installed on a curve, see INSTALLATION OF
THE ET-PLUS™ SYSTEMS ON A CURVE. When installing the ET-
PLUS™
systems outside or inside the curve, the ET must be straight over
the length of the systems. If there are special field conditions
encountered when installing the ET-PLUS™ systems, contact the
state/specifying agency’s engineer. Trinity Highway Products LLC., at 1-
800-644-7976, is available to assist the state/specifying agency, if
needed.
POST INSTALLED IN RIGID MATERIAL
Provide the proper leave out (specified area of open space in the
pavement)
around a post when installing the post in any thickness of
concrete or asphalt.
The top surfaces of any grout or other backfill
placed in the rigid material “leave out” MUST be low enough so that
it does not engage the anchor cable bearing plate at Post 1 or
otherwise obstruct/constrain the
3
/
8
” shear bolts or the ¾” hinge
bolts of the HBA Post.
For "leave-out" information, please consult the applicable state/specifying
agency. Additional source of "leave-out" information/details can be found
in the U.S. Department of Transportation, Federal Highway
Administration, Memorandum B64-B, dated 3-10-04. Trinity can provide
this FHWA memo upon request.
WARNING: Ensure that the proper Leaveout (specified area of
open space in the pavement) around the posts is reserved and
filled with state/specifying agency approved backfill material that
will not prevent movement, for any posts installed in rigid
pavement such as any thickness of concrete or asphalt.
INSTALLATION OF THE ET-PLUS™ SYSTEMS ON A
CURVE
When the ET-PLUS™ systems are installed on a curve, use the following
layouts. All offsets are measured to the face of the rail. Under no
circumstances shall the guardrail within the ET-PLUS™ pay limit be
curved.
Outside the curve: With the line guardrail installed parallel to the
curve, the terminal end is offset from the curve a distance equal to
the line guardrail offset plus the value in Table 1. (See
state/specifying agency drawings for details.)
• Inside the curve (radius Greater than 1000 feet): With the line
guardrail installed parallel to the curve, the terminal end is offset from
the curve a distance equal to the line guardrail offset plus the value
in Table 1. (See state/specifying agency drawings for details.)
• Inside the curve (radius 1000 feet or Less): With the line guardrail
installed parallel to the curve, the terminal end is offset from the
Revised: March 2010
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