Pairing request might be the wrong implementation but he has the germ of an idea. You need an app that says hey heads up, from a cell data signal. The app would also have to do something for the driver of course - maybe real-time traffic monitoring from cars up ahead, or patrol-car alerts as in the old CB radio days. Use your imagination.

For a more mundane idea that would be immediately useful and easy to implement, consider the water bottle cage. Almost all of them are great, or at least adequate, for carrying water bottles, BUT, when you don't carry one or have two cages and only need one bottle, they're pretty much wasted. And un-aerodynamic (though addressing that's been done). The simple idea is install a netting (or some such) inside which does not interfere with a bottle but allows you to drop stuff there. Keys, reading glasses, phone, rain jacket etc. While you're at it fashion a fairing to join smoothly with the down tube or seat tube. I have done this, and the utility is better than people imagine at first impulse. Which if you think about it, is a requirement of any idea that's going to work. If the netting is loose enough, the objects don't bounce out. My cages have a "bag-lady" kind of look - you can design them sleek and carbon fiber.

I've also sometimes wished for a retractable cable lock integrated in the frame. It doesn't have to be super secure, hard to cut etc, just an always-there lock to discourage someone from a impulsive steal and getaway. There have been some attempts at this but they suffer from various defects like being to obtrusive, only a feature of some ridiculous bike, and so on. Design one that is basically invisible, light-weight, and not too obvious to defeat.