Mark,
The number refers to the total number of lanes of the way. Refer to
http://wiki.openstreetmap.org/wiki/Key:lanes for more information.
They should be tagged with "lanes=2" although AFAIK it is meaningless & not
required if it is a bi-directional road (as per the second example on the
web page below). Would be interested in knowing if this is 'standard'
practice or whether EVERY way should have a lanes tag.
Craig

I'm currently doing some edits in Armidale (NSW) following my trip
there for Christmas. Many of the streets and surrounding roads are
labelled "lanes=1". Some of these are clearly wrong, as they have a
painted line in the middle (lanes=2) - I will be changing these, but I
wanted to check what to use if the road (residential or unclassified)
doesn't have centre line markings. Should we use "lanes=1" only if
it's narrow, or in all residential roads without lane markings? (or
leave the tag off completely?) What do other people do?

Mark P.
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