[OSM-talk-be] 1 or 2 lanes ?

[Gilbert Hersschens]

I have a highway with separate roads in each direction. Each road has one
lane for traffic and one breakdown lane to the right. Normally we tag this
as a road with one one-way lane (we only count TRAFFIC lanes, see
http://wiki.openstreetmap.org/wiki/Key:lanes).
The highway goes through a tunnel. Each road has its own pipe in the
tunnel.  When entering the tunnel, the breakdown lane is now marked as a
spare lane where traffic is not allowed (red X signal above the lane). The
idea is to open the spare lane in case of accidents or in case the pipe in
the other direction needs to be closed and the normal lane will be used for
traffic in the opposite direction.
How should this be tagged ?
Change from lanes = 1 to lanes = 2 and back to one when we are at the end
of the tunnel?
Are there additional tags for such a situation ? Examples ?

Gilbert
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