When I was in Almaty, Kazakhstan, they had disused trolly rails laid in the median during the USSR. And right next to them, chinese trolly buses with 2 pantagraphs.

Presumably this tells us its cheaper or faster or more politically feasible to steal the parking lane and build 2 pantagraphs on either side of the road and use rubber-tired, electric-overhead buses than to refurbish existing track in unused RoW and build 1 pantagraph.