Guardrails and their terminal heads are designed to save lives.
But according to some lawsuits, they have become more dangerous since the guardrail head model changed in 2005.
Guardrail piercing cars
In 2010, a guardrail in Florida punctured the floorboard of a truck, slicing through the leg of the 18-year-old passenger.
Two years earlier in Tennessee, a mother died when a guardrail cut straight through the front of her sport utility vehicle.