NHTSA’s Implausible Safety Claim for Tesla’s Autosteer Driver Assistance System [1]

tl;dr ?
"In January 2017, the National Highway Traffic Safety Administration (NHTSA) published the remarkable claim that the airbag deployment crash rate dropped by almost 40 percent in Tesla passenger vehicles equipped with the Autopilot Technology Package [...]  the overall 40 per- cent reduction in the crash rates reported by NHTSA following the installation of Autosteer is an artifact of the Agency’s treatment of mileage information"

Heise has an interesting German summary [2].

[1] http://www.safetyresearch.net/Library/NHTSA_Autosteer_Safety_Claim.pdf
[2]  https://www.heise.de/autos/artikel/Rechenfehler-Tesla-Autosteer-senkt-Unfallrate-nicht-4303949.html