The case centers on an end terminal, which is an energy-absorbing safety device manufactured by Trinity Industries of Dallas.
Whistleblower Josh Harman claims the device was "secretly modified" around 2005, and now, the device does not work as intended.
He says it locks up and can impale a vehicle.
But Trinity argued in court on Monday that the design changes were not that significant, and that Trinity is just the fabricator of the guardrail head.
Trinity says it’s the Texas A&M Transportation Institute, the inventors of the guardrail head, that failed to disclose design changes to the federal government, and that Texas A&M will testify to its mistake.
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