I quote https://wiki.openstreetmap.org/wiki/Key:toll 

> In any case `toll=yes` should be used on any section of road where a toll must be paid to access it.

This supports tagging toll information on this section of Kwun Tong Bypass.

Maybe we can do `toll:lanes=` for https://www.openstreetmap.org/way/799005738. Precedent see e.g. https://www.openstreetmap.org/way/152470472