In fall 2021, York Region Transit and Toronto Transit Commission will launch a one-bus, one-farecross-boundary pilot alongthe Dufferin Street corridor.
https://yorkpublishing.escribemeetings.com/filestream.ashx?DocumentId=22913
It may be inevitable to split the line between the off the road sections and the road sections, unless they short turn more train sets in the underground section or something
So long as it doesn’t stop at red lights at intersections that aren’t stops, including red lights at intersections that are stops where the platform is on the other side of the intersection.