Agreed - that's a pretty small use case, relatively, though. On Tue, Sep 9, 2014 at 1:38 PM, Tod Fitch <t...@fitchdesign.com> wrote:
> Historical and live speed profiles are pretty much required for trip > planning in congested urban areas, but for those of us who drive close to > the speed limit and make long trips on relatively uncrowded rural freeways, > travel time estimates based on posted (or prima facie) speeds are a good > approximation to reality. I travel between northern California and southern > Arizona a lot. The distance is about 1,300 kilometers and only a small > fraction of that is congested urban freeways (especially if I decide, as I > usually do, to avoid Los Angeles). OsmAnd with its knowledge of actual > posted speed limits (many entered by me) does a very good job at predicting > my arrival time. > > On Sep 9, 2014, at 11:48 AM, Martijn van Exel wrote: > > > There's a functional difference between speed limits and the actual > speed driven. For ETA prediction, speed limit data is not all that useful - > detailed historical and live speed profiles are. That is not data that is > in OSM (or should be). The speed limits are mostly useful for alerting > drivers they may be driving too fast. For a system like that to be feasible > you will need comprehensive posted speed limit coverage, which OSM > currently does not have. > > > > Martijn > > > >
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