It's painfully obvious that either they never tested a car backing into the wall or they didn't correctly analyze their data, because there is no way in hell Bowman's wreck should have resulted in a concussion. NASCAR may pride themselves on safety, but they usually have to be dragged to it. It took four dead drivers to get safer barriers and Hans devices, and if one of them hadn't been Dale Earnhardt, who knows how much longer they would have pissed around. How many years did it take to get full safer barrier coverage? Kyle Busch was still hitting an unprotected wall in 2015.