Like I said, some of the cars here had amazing tech that changed the way cars were designed. The Model T changed America and the world, not because it was a marvel of tech but because it was something people could actually have!
I'm not trying to poop on the thread. It's a great thread and a great article. I am quibbling over "most important" when think they should have said "most interesting" or something like that.
Other notable points:
automobiles wound up comnecting people.
road systems were built.
along with roads, it made installing power and phones easier. and maintaining them too.
eventually in many places sewer systems were put in because it made sense to be around roads that would have other utilities and buildings and houses off them.