I had this idea for car to car communication back in 1980, maybe a little earlier. I think it was inspired by the IR port on an Apple Newton. (No bluetooth back then.)
https://en.wikipedia.org/wiki/Vehicular_communication_systems#Development

I had a friend in high school who came up with E-readers in the mid 70s. I reckon we were just in the wrong place to be innovative. Him in West Virginia and me in a traffic jam.