NHTSA
National Highway Traffic Safety Administration, a US DOT agency responsible for vehicle safety regulation and enforcement, which Mark headed for several years.
Videos Mentioning NHTSA

Emilio Frazzoli, CTO, nuTonomy - MIT Self-Driving Cars
Lex Fridman
National Highway Traffic Safety Administration, mentioned as having a similar levels of automation classification.

295 ‒ Roadway death and injury: why everyone should care and what you can do to reduce risk
Peter Attia MD
National Highway Traffic Safety Administration, a US DOT agency responsible for vehicle safety regulation and enforcement, which Mark headed for several years.

MIT Self-Driving Cars (2018)
Lex Fridman
The National Highway Traffic Safety Administration, which identifies the 'four Ds' of dangerous driving: drunk, drugged, distracted, and drowsy.

Chris Urmson: Self-Driving Cars at Aurora, Google, CMU, and DARPA | Lex Fridman Podcast #28
Lex Fridman
The National Highway Traffic Safety Administration, a US regulatory body that Chris Urmson expects to engage with regarding safety demonstrations.