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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