The article doesn't provide much citations for "Bicycle helmets do an outstanding job of keeping our skulls intact in a major crash." which is the premise it st

The article doesn't provide much citations for "Bicycle helmets do an outstanding job of keeping our skulls intact in a major crash." which is the premise it starts out with and builds its case off. Obvious questions arise... like why are motorcycle or pro-sports helmets so radically different in design (full head + visor), even for scooters that barely go faster than bicycles, and how many "major crashes" result in head trauma as opposed to other kinds? And if bicycle helmets are so great, why don't we require car drivers to wear helmets too? Surely then they would also do an 'outstanding job in keeping our skulls intact in a major crash'?