On 2014-11-10 21:51, James Mast wrote:
I'm just curious, but can anybody verify the speed limits that user
msheerin17 [1] has been randomly adding across the US? He seems to fond
of adding a lot of 'maxspeed=55 mph' tags to ways in completely
different areas (he does add other speed limits, but well over 60% have
been 55 mph).
I have tried to contact this user about all the speed limits he's been
adding and did get a response back from him only once (back on October
15th). In that response, he claimed he was getting the speed limits
from "our customers", but at no time did he mention what company he was
working for or what app was generating the input from people of the
'correct speed limits'. He even told me to let him know if I had any
more questions, but he's never responded to any other messages that I
sent him after that asking about that info.
I do know one changeset [2] was at least was partially correct (was for
a small segment of PA-28 and I could verify that since I live near it),
however, a small part he tagged @ 55 mph is still officially 45 mph (the
NB bridge over PA-8 is posted @ 45 mph still, not 55 mph). However,
there are other changesets out there that he did where there is no way
possible the speed limit he added could be correct. [3]
So, if anybody lives near any of his changesets were he's added the
maxspeed tag and can verify if they are either correct or incorrect, I'd
appreciate it. If he's been adding a lot of incorrect speed limits, we
need to nip this in the behind fast before it gets too out of hand. If
most of them are incorrect (being 15+ over the actual posted limit or
more in some places), it could seriously cause problems with the routers
that use OSM data, especially in areas where we don't have any active
mappers to verify said speed limits. Heck, it could even lead to bad
press if somebody gets a speeding ticket and they try to blame OSM for
it because of the incorrect speed limit in the database.
I spot-checked the 50 or so ways msheerin17 tagged in Ohio; the speed
limits look plausible for the most part. Most are undivided rural roads,
which are 55 or 60 mph by default. Suburban arterial roads with 45 or 50
mph limits aren't unheard of, either.
My only beef with their changes is that they didn't split the ways up
before tagging them. Roads leading into town, like [1] and [2], could
well be 50 at one end but decrease in steps to only 25 at the other end.
In fact, I know of several roads where the speed limit suddenly jumps
from 25 to 55 at a village limit.
Wikipedia has a table of statutory speed limits that may help assess
their edits in other states. [3]
[1] http://osm.org/way/302290438
[2] http://osm.org/way/19268121
[3]
https://en.wikipedia.org/wiki/Speed_limits_in_the_United_States#Speed_limits
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