Tod - "Makes sense to have the OSM tagging model the real world in this regard. If we had that the a local mapper could update one value on the administrative boundary and all the roads without explicit maxspeed tagging would be covered."
Agreed. There isn't a better community than OSM to maintain it. If our allied open routing project provides a side repository outside the main OSM but linked (the way e.g. our Notes are) I would happily update that. Without that being created, OSM admin boundary seems the right place. -- Bill Ricker bill.n1...@gmail.com @n1vux [ full reply included below so cc: talk-us-mass has full context ] On Sat, Jan 7, 2017 at 2:25 PM, Tod Fitch <t...@fitchdesign.com> wrote: > > On Jan 7, 2017, at 10:57 AM, Bill Ricker <bill.n1...@gmail.com> wrote: > > > > On Sat, Jan 7, 2017 at 12:44 AM, Jack Burke <burke...@gmail.com> wrote: > >> Hey, Michigan folks, keep an eye out for some speed limit changes.... > [1] > > > > We have a different change hitting Boston as of this last week -- the > > statutory limit on *UNSIGNED* roads/streets in Boston has changed. > > > > Statutory limit had been the state's 30mph (thickly settled or > > business district). > > > > One might presume since this changes only unsigned speed, we haven't > > entered it, so nothing to change. > > But how is a router to know ? > > > > [1] http://www.mlive.com/news/index.ssf/2017/01/75-mph_ > speed_limits_officially.html > > [2] http://www.mit.edu/~jfc/ma.html > > > > Too bad that every time someone proposes having default values based on > administrative boundaries it gets shot down like this one [1] was. > > Many, in fact, almost all residential streets in my state are not signed > with speed limits. I think that is true in most states, but the default > values definitely change with jurisdiction. If I tag them with the default > legal limit when there is no signing, I run the risk that they are not > updated if the law changes. And a person driving the street can’t verify > the value just by looking. If I don’t tag it, then the routing software > will make an assumption on what the speed is and the assumption is likely > based on the part of the world the people writing the software live and > very likely won’t match my area. > > To the people who then say that data should be kept outside of OSM as you > can’t see it on the ground: Point me to a place were a router can get a > world wide set of administrative based default speed limits. To be viable > for routers to use it would need to be an open geographical database. > Funny, that is what OSM is supposed to be. > > Makes sense to have the OSM tagging model the real world in this regard. > If we had that the a local mapper could update one value on the > administrative boundary and all the roads without explicit maxspeed tagging > would be covered. > > [1] https://lists.openstreetmap.org/pipermail/tagging/2016- > October/030330.html > > >
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