Transcript for Two States Suspend New Guardrail Use
ABC's chief investigative correspondent Brian Ross showing us a common type of guardrail with a slight design change. Hundreds of thousands of them on highways across this country, and now, a series of law suits, claiming they are responsible for deadly accidents. Now comes word, state officials taking action. Brian with the news tonight. Reporter: This test film show what is supposed to happen when a vehicle hits a guardrail head-on. A device, the end terminal, absorbs the impact and deflects the rail off to the side. But now in the wake of a rash of accidents where that did not happen, where guardrails pierced vehicles and people inside, state highway officials are taking action. Rebecca dryer lost her right leg. It essentially was a spear that came through my car. Reporter: Lawyers for dryer and others now suing the guardrail company say a slight modification in the design saved a few dollars, but created a dangerous flaw. Makes all the difference in the world. Reporter: This animation shows what the lawyers say can happen with the modified version. And today, Missouri said it is stopping further use of the guardrails and Massachusetts said it will halt their use while they investigate. These are two states that take safety seriously and we're hoping we'll see more states do the same. Reporter: The company, Trinity industries, insists the guardrails are safe, that they've passed crash tests and meet federal standards. These guardrails are in almost every state and to remove them all would be one of the biggest safety recalls ever, David. Brian Ross, thank you. There is still much more ahead on "World news tonight"
This transcript has been automatically generated and may not be 100% accurate.