A new study shows a popular guardrail model lining roadways across the country and one at the center of a possible billion-dollar whistleblower lawsuit is more likely to produce severe injury than it's earlier model. According to the study, the ET-Plus guardrail end terminal, manufactured by Trinity Industries, is 1.36 times more likely to produce a severe injury and 2.86 times more likely to produce death than an older model manufactured by Trinity, the ET-2000.