[mkgmap-dev] Road speed through urban areas

Thu Jul 16 08:11:05 BST 2020

Hi all,

I fear I don't get the point in this discussion. My understanding is that you want a style that sets a lower road class for major roads within a city. Question is in what situation this will lead to better routing. If there is a good alternative route around the city it should already have the higher highway tag in OSM.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Greg Troxel <gdt at lexort.com>
Gesendet: Donnerstag, 16. Juli 2020 01:21
An: Fernando Trebien
Cc: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Road speed through urban areas

Fernando Trebien <fernando.trebien at gmail.com> writes:

> Would mapping boundary=urban [1] help solve the problem of assigning a
> slower estimated speed to ways within dense urban areas in routing
> apps such as mkgmap? [2][3] It looks like an elegant solution to this
> problem that would not have the same issues with verifiability that
> maxspeed:practical has. It is currently common only in France (see an
> example in Rennes [4]) and there is official data available in my area
> that could be imported into OSM. [5]

I don't see why drawing a line that encloses the area where you think
maxspeed:practical is low is any more verifiable.  You are tagging about
an area where people drive slower than the speed limits, I think.  So
it's really the same thing.

Also, maxspeed:practical is easy to verify.  Drive on the road 10 times
and see what the average speed you actually went is.  I have lots  of
commuting data and someday, I will process it and see what the
distributions look like.

If there really are speed limits, then by all means tag them.
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