The suggestion for contact persons/numbers is a good one. I think I'll add a small card to the pouch that says, in emergency contact...
I didn't add another precaution that I use: a hand-held ham radio. If my husband is awake at the time I ride, which is most of the time, the radios are on and we are tuned in to one another, just have to push a button to speak to each other. It's like a cross between a cell-phone and a walkie talkie, and allows him to monitor my rides and vicariously share the experience. So it's a safety precaution as well as a nice way to be together although we are apart.