For the record, 121 km/h is 75 mph. I think Texas and New York (at least) have these speeds.
-- Saikrishna Arcot On Wednesday, May 07, 2014 02:45:52 PM Richard Weait wrote: > Dear imports@ > > A followup on the fleet manager max speed data. > > So far, I have explicit permission for using the data in OpenStreetMap > from the publisher. I hold the test file, nobody has yet imported any > of the data. > > Some new items. > > On various lists / direct email, I've had technical suggestions that: > > - We use an identifier for the submitter of the data. So that we can > learn to trust one driver or another, more or less. > - We get a time stamp, or osmid version number with the way number, so > that we know that we are looking at a way that is unchanged since the > maxspeed report. > > Both are fair enough as technical suggestions. > > I would describe the community response as "cautious optimism". So > far no suggestions that the data is unwanted or inappropriate. Most > of the questions are around, "how can we best use this data?" and > "sure. better speed limit data sounds good." > > I've also looked at the data in more detail. > > 1) While I initially thought the data was limited to Canada / US, that > is not the case. The data is worldwide, as the fleets involved are > international. That's good and bad I suppose. :-) More communities > to get on board for us to proceed, I guess. On the other hand a > country by country roll-out will probably help to limit negative > effects. :-) > > 2) I expected the data to be entirely sensible and reflect the posted > speed limits. I was surprised to find that some of the speed limits > are off-by-one of what I would expect. Here is a summary of the km/h > data only, shown as number of reports followed by km/h value > > 1 30 > 1 35 > 1 40 > 24 50 > 32 60 > 18 70 > 164 80 > 4 90 > 14 100 > 2 121 > 8 130 > > see that "121"? That surprised me. I don't know for sure that it > isn't on a sign somewhere, but still. :-) > > We could campaign for more warnings for the submitters to only include > actual signed values. These could also be typos. We could drop data > like this as unreliable, do something else with it. > > Next steps: > > I'd like to look at the data in more detail. The current format > (way_id and max_speed) isn't ideal for a slippy map overview, so I > added a few wayids to a slippy map with overpass. Could you suggest a > nice way to do this so that I get 1400+ ways on a slippy map, without > hammering the edit api? > > And from there, I'd like for some other mappers to take a look and > sanity check the data in their areas. Perhaps by backing it up with a > ground survey. Of course, I don't yet know where there are enough > items in an area to make it worthwhile. So perhaps a visualization > first. > > best regards and happy mapping, > > Richard > > _______________________________________________ > Imports mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/imports
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