I've known about the busway=opposite_lane tag for a year or two and used it.
The bus lanes wiki page mentions a broader alternative, the PSV scheme. For a
bus routing application, we need to know which scheme to support. Busway is
probably more widely used, so it makes sense to support it for compatibility
reasons. Nevertheless, the buses talk page argues against busway while
referring to the approved Public Transport Schema. Public Transport Schema does
not seem to include tagging for exclusive bus lanes. I also have no data on
whether if anybody is adopting the PSV scheme for buses. Would somebody like to
chime in on the matter?
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