I looked at HD for a "Threshold" for the 16' door. They really didn't have anything. I stopped at the local garage door place, they have the rubber strip material "Weathertech"? It was $5.75 per foot, would have been like $90.00, to do the 16' door.(it comes with it's own glue)
http://www.improvementscatalog.com/home/improvements/792924262-garage-door-threshold-seals.html
I am entertaining the thought of using a 16' piece of 5/4 deck board? The compsosite stuff, made from recycled plastic? Stand it up on the table saw, put a nice lead on the front and back. Countersink some "Tapcons", and use some "Liquid Nails"?
I just need to trap the leading egde of the VCT, and block some of the dirt and leaves, from blowing in off of the driveway. But in this senario, I would need to run the VCT under the door, and the 5/4 would sit just in front of the door (driveway side of door), when it is closed. I am not sure I want the door closing on the VCT? Not sure why, I just didn't envision it that way.