I have seen this on the news where the local police are suggesting the use of ICE on cell phones. I agree this is a very good idea, for use by first responders.

On my cell phone, I have input 2 ICE numbers. They are for my sister and friend, and are both cell phones. I have them listed as "ICE 1 - (name)" and "ICE 2 - (name)". This way, one of them is likely to be carrying their cell phone. Also, the responder can say something like "...(name), I'm a responder calling regarding the_traveler who was injured ..."

If you only have "Home" programmed into your memory, and no one is home and you are across the country, it isn't going to help much. But with seperate ICE numbers (preferably cell phones), it is more likely to be answered and responded to.