Google HAN's device...
https://en.m.wikipedia.org/wiki/HANS_device
"A major cause of death amongst drivers during races was through violent head movements, where the body remains in place because of the seat belts but the momentum keeps the head moving forwards, causing a basilar skull fracture resulting in serious injury or immediate death.
Notable race car drivers who died from basilar skull fractures include:
Formula 1 driver Roland Ratzenberger [3] in the 1994 San Marino Formula One Grand Prix. (Ayrton Senna also sustained a basilar skull fracture that might have been lethal in this Grand Prix, but the official cause of death was brain penetration by shrapnel[citation needed])
Indy 500 drivers Scott Brayton, Bill Vukovich and Tony Bettenhausen
NASCAR drivers Adam Petty, Tony Roper; Kenny Irwin, Jr.; Terry Schoonover, Grant Adcox, Neil Bonnett, John Nemechek, Dale Earnhardt, J. D. McDuffie, and Clifford Allison
ARCA driver Blaise Alexander
CART drivers Jovy Marcelo and Gonzalo Rodríguez"