Highway guardrails are supposed to be designed so that if a vehicle hits the end of the guardrail, called the “rail head” or “end terminal,” the metal will peel off the posts it is attached to and away from the vehicle. Trinity Industries, a manufacturer of guardrails for roads across the country, allegedly redesigned its highway guardrails in 2005 without notifying the Federal Highway Administration (FHA). In the modified version of the highway guardrail, Trinity Industries reportedly shaved an