Road ID is expensive if all you want is a tag. They have some enhanced features if you need that, but otherwise military style dog tags can be found much cheaper. Personally mine has just my name and a couple emergency contacts (name and number or just number works). I often go for my morning trail ride without bothering to take any ID so the contact info is important. I probably should carry my drivers license and medicare card, but have not been doing so lately. I tend to take those along with a credit card and a little cash when I am on the road bike or if I am on a trail ride that I drive to.

In any case I figure that the regular ID and I just might be separated so the dog tag just might come in handy even to identify me. Also it may be harder for them to track down family without it.