On 9/28/10 9:08 AM, M∡rtin Koppenhoefer wrote:
2010/9/28 Richard Welty<rwe...@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
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