I've wanted to build a mobile app for a few years that you can use to scan in the license plates of all the cars around you as you drive, gradually building up

I've wanted to build a mobile app for a few years that you can use to scan in the license plates of all the cars around you as you drive, gradually building up a list of drivers who go the same route at around the same time, and then present a way to connect those folks together. I dream about it, anyway, deadlocked in traffic. (Well I did, before I got my Vespa, anyway..) So it seems we're getting closer to the reality that one day I can just pick up my phone and broadcast a virtual thumb into the sky, for anyone in the area who goes the same way to pick me up ..