bkmap:
It is not too late to change this. We must change about 11+2+7=20 tags worldwide if we consider to modify the notation of the lanes:*:tag.
I'm strictly against global retagging. And it's impossible to unambigously resolve number of lanes to lane numbers in most of those cases.
Using verbal values like left and right (except turn...) is IMO more fault-prone than defined lane numbers. We need anyway suitable editor tools for lanes.
Actually, this proposal was designed with the aim of not requiring special editors or plugins to mark turn lanes...
It leaves open too many issues which could appear later: How to tag the lane width, different surfaces and restrictions like forbidden lane change? How the data consumer knows, how the lanes of the road segments are connected together? And so on...
...and obviously, this implies some restrictions on tagging scheme: it's unpractical to add information for every lane into tags: there would be too many tags for each road segment. So in the proposal there are no properties for separate lanes: this can be impoved later, possibly with relations. For example, Tordanik is drafting out http://wiki.openstreetmap.org/wiki/Proposed_features/Lanes_as_Relations with exactly those points in mind.
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