GMET Median Terminal
The Gregory Median End Terminal (GMET) is an energy-absorbing median guardrail end terminal, designed to minimise the severity of impacts occurring at the end of the guardrail safety barrier system. Developed by Gregory Highway of the USA, the GMET has been successfully crash tested in accordance with MASH Test Level 3 and is designed for direct attachment to back-to-back RamShield Median W-Beam guardrail.
The narrow width of the GMET prevents encroachment into adjacent traffic lanes, an important design consideration for installation in narrow medians.
Product Features
MASH TL3 Compliant
Containment of a 2270 kg pickup truck travelling at 100 km/h.
Narrow Width
No blocking pieces reduces the system width to just 320 mm.
Leading Safety
Crash test impacts produced nil detached elements, demonstrating suitability for installation at high-risk median sites.
Compatibility
Same system width and system height as RamShield Median W-Beam.
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Related Products
RamShield Median W-Beam is a back-to-back guardrail system providing safe vehicle containment and redirection when impacted from either side of the system.
Frequently Asked Questions
What is the crash test compliance of the GMET?
The GMET has been fully crash tested and evaluated according to the specifications for Test Level 3 (TL3) of the AASHTO Manual for Assessing Safety Hardware (MASH).
How does the GMET work?
During end on collisions, the impact head engages the bumper of the errant vehicle. This activates the sliding action of the w-beam rail assemblies which are fabricated with slots designed to tear when contacted by the threaded rod assemblies installed at each C-post. The C-posts feature joggle tabs which provide controlled release of the w-beam rail assemblies. When contacted by an errant vehicle, the C-posts yield by bending proximate to ground level.
When is installation of the GMET required?
The GMET is designed for direct attachment to RamShield Median W-Beam and reduce the severity of impacts occurring at the end of the guardrail barrier system.
Is a transition required when connecting the GMET to RamShield Median W-Beam?
No. The system width of the GMET and RamShield Median W-Beam are identical and feature back-to-back w-beam guardrail connected directly to C-posts.
How are the GMET C-posts installed?
The GMET C-posts are driven directly into the ground and do not require soil plates or concrete
What is the GMET beginning length of need?
The beginning length-of-need or point-of-need is the location along the terminal that has demonstrated complete containment and re-direction of a 2,270 kg pick-up truck travelling at 100 km/h and impacting at 25 degrees. The GMET point-of-need is C-post location 3, a distance of 4.9 m downstream from the ground anchor.
What is the length of the GMET system?
The length of the GMET measured from the impact head to the downstream connection to RamShield Median W-Beam is 13.43 m.
Can the GMET withstand a reverse direction impact?
Yes. The MASH TL3 crash test matrix requires a reverse direction impact performed with a 1100 kg passenger vehicle travelling at 100 km/h and 25 degrees.
Can standard guardrail components be used for the assembly of the GMET?
No. The installation of the GMET features slotted w-beam guardrails, designed to absorb the kinetic energy of a vehicle during a head-on collision. Only genuine parts are to be used for the assembly of the GMET.
Can the GMET be installed on a curved roadway?
The guardrail beams used for the assembly of the GMET end terminal must be straight and cannot be factory curved. It is therefore recommended that the median guardrail installation be extended to a location that will facilitate parallel alignment of the GMET with the roadway.
