[OSM-talk] [Tagging] - RFC - Motorway_link implies oneway=??
hawke at hawkesnest.net
Wed Oct 8 23:48:08 BST 2008
Claudius Henrichs wrote:
> Can you tell any advantage of implying highway=motorway_link to be oneway?
It depends on what you're comparing it to.
versus implying it to be oneway=unknown, there's a reduction in the
amount of tagging needed because less than 100% of the ways with
highway=motorway_link need to be tagged with oneway=yes/no. And of
course, a routing application specifically can't use oneway=unknown
(they have only the choice of "use the way for routing" or "don't use
the way for routing". So a routing application would have to make their
own decision on which assumption to make)
versus implying it to be oneway=no, there's *probably* a reduction in
the amount of tagging needed, because there are probably more ways with
motorway_link that are oneway=yes than oneway=no. In addition, for a
routing application it increases safety. It's a lot worse to route
someone the wrong way up a one-way motorway_link because it was assumed
to be two-way than it is to send someone on a longer/slower route
because it was assumed to be one-way.
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