[taralx]

In case people are wondering:

"SDV" has been in use since at least 2011: https://scholar.google.com/scholar?cluster=10460039591121716...

The level classifications appear to date from 2013: http://www.nhtsa.gov/About+NHTSA/Press+Releases/U.S.+Departm...

[Carrok]

In case more people are wondering still:

"SDV" is not an acronym but an initialism. TIL that in today's thread about TIL: https://news.ycombinator.com/item?id=11069206

[aidenn0]

In American English it's pretty well accepted that Acronym includes initialisms, and in fact the word initialism is hardly ever used.

[Carrok]

Wow, didn't mean to offend anyone, thought it was a cool bit of info.