Car manufacturers were discussing this kind of thing about 15 years ago. We were working on diagnostic and emissions checking standards but there was the expec

Car manufacturers were discussing this kind of thing about 15 years ago. We were working on diagnostic and emissions checking standards but there was the expectation that we would be able to make use of secure network links to cars at some point in the future. The question at the time was which would come first. Would a requirement to do emissions testing under real-world conditions push the introduction of radio networks that could also be used for cars to talk to each other or would the road-train type applications be the initial use case.