Which is fine, I don't have any issue with that, if it is logical for services to cross municipal boundaries, then that is exactly what should happen, and I'm in full favour of fare integration across the GGH, too, but any kind of numbering scheme goes too far in service of this. Unless or until such time as the various transit agencies of the GGH are all consolidated under the Metrolinx umbrella, it is still necessary to distinguish between them. And even then, it may be necessary to distinguish local routes by the region they serve, as the overwhelming majority of Toronto routes will only run in Toronto, and ditto for any other city nearby, so I'm not sure we'd achieve anything by abolishing the separate agencies at all.