Echoing the thoughts above....
Please wear ID when you are running away from the house. You never, never know when you may not be able to speak for yourself. Purchase most any version but one that attaches to the shoe. Your shoes may not survive a car on runner impact. If dark (likely) the shoe with your info may not be found.
I know the importance of an ID as I am a survivor of a car on runner hit and run about 8 years ago. It was an early morning run in a new town. I left the room with all my gear but noted I did not put the RoadID on just as the elevator doors opened. I made the fateful decision to go back for the ID. Fortunately I did as a short 20 minutes later I was laying in the middle of an intersection after being sideswiped by a hit and run driver. I was lucky, I had no real injury other than pride.
Get an ID and wear it. Wear it in the races as well. However, one should still fill out the back of the bib. Med tent folks are going to go through a progression and if you did not fill out the back of the bib you prolong any outside contact. Maybe not by much, but why not take the additional couple minutes.