 To date, 27 states have adopted this guardrail design, 10 more are currently adopting it, and the remaining 13 have adopted or are evaluating slight variation of this system.Following Dale Earnhardt’s fatal wreck in 2001, NASCAR commissioned Sicking to determine the specific cause of Earnhardt’s worst injuries.Sicking use video footage to analyze and reconstruct the crash, as well as NASCAR’s worst crashes over the 10 years prior.