The original article was published at https://affiliates.legalexaminer.com/transportation/sierra-sam/. So... what exactly is a crash dummy? A crash test dummy is an anthropomorphic testing device (ATD). This is a fancy way to say that a crash dummy is a mannequin that closely imitates the size, shape, mass, stiffness and energy absorption of an actual human being. He (or she) is then placed in the awkward position of testing vehicles for crash resilience ...