I ride about 95% alone, too. Most of my road routes are commuting to my part-time job (I'm retired) or on a few of my gravel grinder routes which are designated as 20, 30, or 40 mile rides. I always tell my wife where I'm headed or I leave a note - mostly for her assurance. My mountain bike rides are on trails that see enough traffic that there would usually be someone passing by if something happened. Plus, I alway have the phone with me.