The slide deck mentions it if you read the whole thing:
The point of FAST, from how I read it, is that it’s supposed to upgrade existing bus services, rather than replacing them with something on the same corridor (like how the New Bern Ave. BRT will basically replace GoRaleigh Route 15).
Doing FAST means making investments like running more frequent buses, BOSS service (running buses on interstate shoulders), and lanes and stoplights that give priority to buses. I think a better way is to think of it as a way to make “normal” buses look and work more like BRT:
