FLEAT End Terminal FAQs
How does a FLEAT End Terminal function?
The FLEAT-SP guardrail end terminal is a flared, energy-absorbing end terminal, designed to minimise the severity of impacts occurring at the end of the safety barrier system.
During head-on impacts, the FLEAT-SP impact head slides over the w-beam guardrail. The w-beam is sequentially kinked as it moves through the head. The kinking action of the rail absorbs the kinetic energy of the impacting vehicle and brings the vehicle to a controlled stop.
What crash testing has been performed with the FLEAT End Terminal?
The FLEAT-SP has been crash tested and assessed in accordance with Test Level 3 (TL3) of the National Cooperative Highway Research Program (NCHRP) Report 350.
Crash testing of the FLEAT-SP in accordance with NCHRP Report 350 TL3 was undertaken with an 820kg small car and a 2,000kg pick-up truck travelling at 100km/h.
At the nose of the terminal, these impacts are performed end-on or at angles up to 15°. Along the length-of-need, impacts are performed at 20°.
What is the length of the FLEAT End Terminal?
The FLEAT End Terminal is available in two length options;
- The 7.62m FLEAT-SP (TL2) is approved for speed zones up to and including 70km/h.
- The 11.43m FLEAT-SP (TL3) is approved for all speed zones up to 110km/h.
What is the spacing between posts?
The spacing between posts is 1905mm.
How is the flare achieved?
The straight flare of the FLEAT is achieved by progressively setting back the position of the posts. Curved guardrails are not required.
What is the required flare?
The FLEAT-SP may be installed at a variable flare.
- The 7.62m FLEAT-SP (TL2) flare must provide an offset distance of between 510mm and 810mm measured over the full length of the terminal.
- The 15.24m FLEAT-SP (TL3) flare must provide an offset distance of between 760mm and 1220mm measured over the full length of the terminal.
What is the advantage of using a flared terminal?
A roadside barrier is considered to be flared when it is not parallel to the edge of the travelled way. Motorists are less likely to perceive roadside barriers to be a hazard if the terminal gradually flares away from the approaching traffic.
Introducing a flare allows the barrier to be located further away from the roadway reducing the potential for head-on impacts.
Another significant benefit of installing a flared terminal is reducing the overall length of barrier required to shield a roadside hazard. Over numerous sites, this can provide a significant cost benefit and reduce the time workers spend by the roadside.
What is the point-of-need for the FLEAT End Terminal?
Since all w-beam guardrail end terminals fall into the gating category, it is important that the terminal point-of-need is identified. This is the location along the terminal that has demonstrated complete containment and re-direction when subjected to a 2,000kg pick-up truck impacting at 20°. When assessed for TL3 conditions, the speed of the impact is performed at 100km/h.
The FLEAT-SP point-of-need is post location 3, a distance of 3.81m downstream from the start of the terminal.