[Tagging] emergency bays - which side?
Volker Schmidt
voschix at gmail.com
Mon Jan 1 12:19:03 UTC 2018
Emergency bays and bus bays are physically very similar, i.e. a short piece
of an additional lane on a road.
Unfortunately the two tags highway=emergency_bay and
bus_bay=both|left|right use very different approaches to describing
essential the same physical arrangement.
bus_bay=both|left|right
highway=emergency_bay
wiki page
https://wiki.openstreetmap.org/wiki/Key:bus_bay
http://wiki.openstreetmap.org/wiki/Tag:highway%3Demergency_bay
node
no (according to the wiki page)
yes (in reality there are few cases of bus_bay=yes with highway=bus_stop)
yes
node example
http://www.openstreetmap.org/node/2134413721
http://www.openstreetmap.org/node/1690562827
http://www.openstreetmap.org/node/4892296128
http://www.openstreetmap.org/node/3246948212
way
yes
yes
way example
http://www.openstreetmap.org/way/253182588
http://www.openstreetmap.org/way/460019134
left|right|both
yes (mandatory)
not foreseen in the wiki page
node: 55
way: 1715
node: 3710
way: 642
I personally like the bus_bay approach better, but I see the drawback of
having to split the road way twice for every occurrence, when you use the
type:way approach
The emergency_bay approach is easier to map if you only consider the node
approach and only on one-way streets, assuming that you can define the
default as being on the right-hand side for right-hand-drive countries (and
symmetrically for the left-hand ones). For dual lane traffic or for
emergency bays on the "wrong" side of the road you need an agreed way to
define which side of the road. I do not like the way approach of the
emergency_bay tagging, as it actually requires a separate way, which does
not reflect the reality on the ground.
As both tags are so far relatively low-use, it may not be too late to unify
the bus_bay and emergency_bay mapping approaches.
Volker
>
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