A series of crash tests have begun for a type of guardrail end terminal that has been linked to accidents with deaths and Crash tests begin on guardrails linked to deaths across country SAN ANTONIO - A series of crash tests have begun for a type of guardrail end terminal that has been linked to accidents with deaths and Check out this story on WUSA9.com: http://on.wusa9.com/1Ag6gEa SAN ANTONIO - A series of crash tests have begun for a type of guardrail end terminal that has been linked to accidents with deaths and catastrophic injuries across the country. The Trinity ET-Plus will undergo a series of eight crash tests at the Southwest Research Institute starting Wednesday.