Rob replied:
From what I understand the cycleway:left=lane ( right) is the
correct way to tag
these. The choice of 'left'/'right' depends on which way the road
is drawn in OSM.
As you probably already know all roads (ways) have a direction
which can be found
by selecting the way and looking for the arrow next to the rubbish
bin icon. 'Left'/'Right'
is then based on the direction of the way, therefore you will need
to make sure
that OSM's and DfT's ways are drawn in the SAME DIRECTION before
merging!
As noted in a previous post, most other tags use
'forward'/'backward' rather than
left/right. Personally I think this would be a better tag as it
provides the data that
routing software requires (without the need to know which side of
the road each
country drives on). On the flip side, it would make rendering a
little harder.
Thanks Rob, but in this case the lanes are on both sides of the road
in the relevant places. And, as you note, left and right are
relative to the direction of the OSM way, so the direction each
country drives on isn’t relevant. I guess I was really asking is
whether I should tag both :left and :right or whether there was a
:both equivalent.
In the case of cycle lanes you need to use left and right precisely
because it eliminates the need to know which side people drive on,
which using forward and backward would require.
Things noted with the DfT data this morning while looking at local
data.
* Ncn ref typo: 15 where it should be 51
* Use of highway=byway and highway=BOAT in the suggestions (the
first for a parking aisle in a car park by some shops, the second
for a short cul-de-sac which leads to a public footpath).
* Use of lcn for the international (icn) North Sea Cycle Route
section in the area.
* Tagging suggestions for a way which has clear no cycling signs at
either end as a cycleway (there is a parallel cycleway which is also
in the DfT data).
So, not simply importing this data was a wise decision. Locally it
is mainly adding surface and est_width (and sometimes lit) tags
which has needed doing.
Ed
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