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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