The ET Plus® System is a tangent, energy-absorbing guardrail end terminal system that highway authorities specify for use in conjunction with standard guardrail on the shoulder or median of a roadway. The ET Plus® System has been a respected and proven guardrail end terminal system for more than a decade.
Texas A&M Transportation Institute (TTI) developed, designed and tested the ET Plus® System. Under license from TTI, Trinity Highway manufactures and markets the product.
Since 2000, the Federal Highway Administration (FHWA) has accepted the ET Plus® System for Federal-aid reimbursement to states that select the ET Plus® System for use on the National Highway System and other state roadways.
In 2005, TTI engineered an improvement to the ET Plus® System that resulted in a reduction from 5 inches to 4 inches in the width of the guide channels attached to the extruder head component of the system. This improvement to the system was originally crash tested in 2005. The FHWA re-affirmed on multiple occasions the continuous eligibility for Federal-aid reimbursement of the ET Plus® System with 4-inch guide channels. Trinity did not sell any ET Plus® Systems with 4-inch guide channels until the FHWA issued its letter of acceptance in September 2005.
At the request of the FHWA, additional tests were conducted on the 4-inch guide channel ET Plus® System from December 2014 through January 2015, to confirm the system meets the applicable NCHRP Report 350 crash test criteria.
The ET Plus® System head assembly consists of three main components – the extruder head, the impact plate and the guide channels. There are not multiple versions of the ET Plus® System extruder head. The design of the ET Plus® extruder head and impact plate remains the same today as when it was introduced in 2000.