Originally Posted by
Often1
The DHS Real ID website is quite clear:
...
2. The DHS website now states that after 1/22/2018, if you cannot present a valid state REAL ID or a listed federal ID, e.g. passport card, GE card, you will not be admitted to the checkpoint. It does not contain the carveout for lost/stolen ID's. That may well be an omission, but it is not something I would rely on until it is rewritten.
I think that the DHS timeline is actually quite confusing, and it took me a while to fully understand. Point 2 given above is, I believe, incorrect. My reading of the material suggests that an ordinary driver's license will usable until October 1, 2020, as long it is from a state that has implemented REAL ID or that has an extension.
Often1's follow-up point (I've lost the quote) is certainly right; it's time to seek an alternative ID if you are from a state with an extension that is expiring.