[Tagging] Residential roads

[Richard Welty]

  On 9/28/10 9:08 AM, M∡rtin Koppenhoefer wrote:
> 2010/9/28 Richard Welty<rwelty at averillpark.net>:
>> but do get the speed limits and set maxspeed, as otherwise any
>> routing software will likely make wrong assumptions. if there is no
>> posted speed limit, find the one for the state in which you are
>> mapping as again, routing software will otherwise be forced to
>> make assumptions.
>
> I do this in general, and if no sign is there I recommend to tag the
> limit still explicitly in maxspeed and add source:maxspeed (I use it
> also for signed limits):
> http://wiki.openstreetmap.org/wiki/Key:source:maxspeed
i agree.

it's crucial to be specific, the defaults vary widely from state to
state within the US. i talked to Nakor about the defaults in mkgmap
a while back, i think what mkgmap does by default is reasonable
for many states, but not a good match for New York. there is no
reasonable default that works everywhere, so it's best to avoid
depending on default values.

i will add that we should also all be trying to get turn restrictions
right for the routing software as well.

richard