[rtkwe]

In the early stages or sufficiently low levels of B they can. The NHTSA doesn't investigate every crash like the FAA does for plane crashes.

[sokoloff]

The NTSB has a much larger role than the FAA in plane crash investigations.

[rtkwe]

True I knew in the moment I wasn't quite right about the exact agency. The core point stands though imo, car crashes don't receive the same scrutiny airplane crashes do in most cases.