I have a neck (dog tag) RoadID that I will probably update soon, ordering one for my sweetie and one for myself. I wear it for cycling and running,

I feel it's better to have some kind of ID on my body instead of, say, in my helmet, in my saddle bag or even on my jersey pockets. Especially if I had allergies (which I don't). If I was seriously injured, it could take a while before first aid people opened my saddle bag in search of identification or other info. (Or, in a major crash, the saddle bag could go missing.) I think though that I'll leave a more detailed contact sheet in my saddle bag, the info on the RoadID being rather limited, which is an issue for me as I often ride in areas where I am only temporarily, away from home. So having local contacts would help.

Also, if you have a cell phone, of course carry it with you, and make sure you program an "ICE" number in it (or simple: EMERGENCY). It means "In Case of Emergency". Could have some sort of detail next to it (like : "ICE Mom"). I heard somewhere (probably here) that paramedics are trained to look for it now...