[Tagging] when should highway=centreline be used?
t.pfeifer at computer.org
Wed Oct 28 11:18:35 UTC 2015
We need to distinguish two questions, which were mixed up in the
previous discussion, namely
a) should a centre line be mapped at all,
b) if so, how should it be drawn and tagged.
As for a), mapping certainly provides a value on a road with
bidirectional traffic. We can map if it is a solid or dashed line,
or if it is missing.
For a dual carriageway, which is physically separated and therefore
mapped as two separate ways in OSM, I see no value. However these
were examples cited before, where highway=centreline was added to
a physical barrier.
So for b), the centre line needs to be an attribute of a linear highway,
thus tagging highway=centreline does not work. It is also semantically
wrong, since the line is not a highway, and adds a new feature to the
historic elements in the highway valuespace that are not highways
either (highway=traffic_light etc).
Thus we would need a new key as follows:
As the line might not always be in the centre, a better name would be
The following existing tags need to be considered in this context:
The proposal for Key:road_marking scares me, if we start mapping every
dash of a line we will end with complete clutter.
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