I'm taking the ID thing to heart. Just typed up basic emergency information (name, address, allergy information, 2 emergency contact/phone numbers) and I'll print it out and laminate it so I can carry it on all my runs for which I don't have any other identification on myself, maybe even runs for which I do have other identification.
This can be quite inexpensive if you do it yourself and it could save your life and a lot of stress on your family in an emergency. No excuses not to do it. I'm actually embarrassed that I haven't done it about 2 decades ago.