[Tagging] Wild changes to wiki pages changing the cycleway tagging scheme
theswavu at gmail.com
Sun Mar 17 03:47:26 UTC 2019
On 17/3/19 10:42 am, Martin Koppenhoefer wrote:
> 49 out of 65000.
Not sure what I am supposed to do with this factoid. Maybe if I try and
explain the problem in a form that you can't just look up on taginfo:
Let's say we have two keys: key_a and key_b. key_a can have a number of
value_1: which also implies the presence of an object of type O
value_2: which also implies the absence of an object of type O
and for both values of key_a there is also key_b which can have a number
of values but let's assume that this is value_3 for both cases. So the
logical problem is that both values of key_a map to the same value of
key_b, making it is impossible to definitively state if an object of
type O is present or not given only the fact that key_b=value_3.
There are some thousand of shared_lane though. I didn’t know this tag,
historically the cycleway tags were used for bicycle infrastructure,
seems people are working to change this.
I hadn't realised that shared was so new and radical. However if you
want to make cycleway:[...]:oneway=-1 the recommended way to map these
things then you are going to have to have a value for cycleway that will
work to replace the existing tag cycleway=opposite. I suppose that an
option would be to recommend that mappers don't use cycleway=opposite
and just use oneway:bicycle=no instead.
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