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  6. Gregory Median End Terminal (GMET)

Gregory Median End Terminal (GMET)

The Gregory Median End Terminal (GMET) is an energy-absorbing median 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.
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.

Mash 3 Compliant-02

Features

  • Accepted by the Austroads Safety Barrier Assessment Panel (ASBAP).
  • Complies with MASH TL3.
  • Complies with AS/NZS 3845.1 Road Safety Barrier Systems & Devices.
  • 13.43m system length.
  • Narrow system width with no blocking pieces required.
  • Same C-Post profile as RamShield® Median C-Posts.
  • C-Posts are driven directly into the ground.
  • No soil plates required for the installation of the C-Posts.
  • All steel construction with hot dip galvanised components.

Crash Test Performance:

Gregory Median End Terminal (GMET) FAQs

What is a roadway median?

The median is the strip of roadway or land that separates opposing directions of traffic on a divided highway or road.

What is the purpose of the median?

The main purpose of the median is to improve safety by reducing the potential for head-on collisions and managing turning movements. 

What is a median safety barrier system?

A median barrier system is designed to provide vehicle containment and redirection when impact from either side of the barrier. These barriers are used in narrow medians to reduce the potential of head-on collisions.

When is the GMET required?

The GMET is designed for direct attachment to RamShield Median w-beam guardrail and reduce the severity of impacts occurring at the end of the RamShield Median guardrail system.

Is a transition required when connecting the GMET to RamShield Median?

No. The system width of the GMET and RamShield Median 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 2,270kg pick-up truck travelling at 100km/h and impacting at 25°. The GMET point-of-need is C-Post location 3, a distance of 4.9m downstream from the ground anchor.

How many full-scale crash tests were performed on the GMET?

The GMET is classified as a gating, re-directive terminal. Gating terminals are designed to allow vehicles impacting near the beginning or nose of the system to safely pass through the unit and travel behind the terminal. Seven (7) full-scale crash tests were performed to demonstrate compliance with MASH TL3. 

How is the GMET manufactured?

The GMET is an all-steel construction. After fabrication the components are hot dip galvanised providing a durable finish.

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