What "Skeptic" said.
What Amos said, too.

You know, I probably will go and renew my passport soon, because right now I have only one ID that airlines will accept when I fly. I am terribly afraid that someday I will miss a flight because I have misplaced my driver license. If I had two pieces of picture ID, I would have a back up.

If everything rides on that one card, God help you if you lose it or it is stolen!

Recently, I missed an important engagement in Seattle, because I got about an hour away from Portland and realized that I had forgotten my fanny pack (containing my driver license), and I was going to be in Seattle for a week. I had to make a quick decision, and I almost went on to Seattle without the fanny pack, because the only thing I really needed in it was my driver license.
I was not sure what would happen to me if I were in an accident or stopped by the police without it. Would I be guilty of driving without a license? Would my insurance be void?

Anyway, if you consider the inconvenience ( and expense) that this faux pas cost me, imagine if you had to have a National ID Card on you even when riding a bus, walking, riding a bicycle, or carpooling!

I may even have been wrong about the driver license. I just did not want to take the chance. Maybe I could have gone on without it and suffered no sever penalty.

Genie