"You have to basically gain root access to the MCU [Media Control Unit]..."
"In most Tesla crashes, then, crash footage exists. It's not great resolution, but it's good enough for government work. "It has to send these messages over the CAN bus very quickly to save them from the camera to the MCU," Hughes explains, "so they have to be dumbed-down resolution so that they can actually make it to the MCU before anything bad happens to it in a crash." This transfer seems to be triggered whenever the airbags deploy, and "takes some amount of time," he says — in his estimation, probably "about 20 seconds." So, for the May Autopilot fatality in Florida, which left the Model S roofless, the crash footage probably didn't make it to the MCU."
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