EDSA — extended to where it actually starts.
EDSA is Metro Manila's proven spine — and it already has a working BRT in the EDSA Carousel. The Yellow Line extends that success northward through Malabon and Navotas. Navotas Terminal is the shared terminus with the Green Line (L5), making it the critical junction for commuters arriving from Cavite, Batangas, and Laguna via PITX.