On Mon, Aug 09, 2010 at 09:45:33PM +0200, Valentijn Sessink wrote:
>Since r1431 (2009-12-10) bike routing has, IMHO and for my situation,
>degraded. When I'm building biking maps for the Amsterdam region, I'm
>using a style file from r1430.
Relying on bicycles for most of my transportation needs, I take this
seriously. Let me try to reason what is causing the breakage.
r1431 changed the minimum resolution of a few items. I believe that it
has been established that the resolution will not affect routing, as the
routing will take place at resolution 24. It also changed the road_class
or road_speed of the following:
junction=roundabout:
road_speed=2 or 1 instead of 5,4,3,2
road_class unchanged
highway=motorway:
road_speed=7 instead of road_speed=6
highway=motorway_link:
road_speed=2 instead of road_speed=3
road_class=3 instead of road_class=4
highway=trunk:
add bicycle=no, foot=no (these were not added previously)
road_class=4 instead of road_class=3
highway=trunk_link:
add bicycle=no, foot=no (these were not added previously)
road_class=3 or 4 instead of road_class=3
road_speed=2 instead of road_speed=3
highway=* & motorroad=yes:
add bicycle=no, foot=no (these were not added previously)
highway=primary_link, secondary_link, tertiary_link:
road_speed=1 instead of 2 or 3
highway=minor:
road_speed=3 instead of 2
highway=unclassified:
road_speed=3 instead of 2
road_class=0 instead of 1
highway=living_street:
road_speed=1 instead of 2
highway=service:
road_speed=2 instead of 1
highway=path:
road_speed=1 instead of 0
highway=road:
road_class=0 instead of 1
road_speed=1 instead of 2
>Please note that this is for the Netherlands (which has many, many
>roads and and abundance of bicycle paths on OSM) and for bike routing,
>which has it's peculiarities on it's own.
I seem to remember that someone (Felix?) mentioned that Garmin bicycle
routing knows two values of road_speed: zero and nonzero. Before r1431,
highway=path and highway=cycleway got different road_speed: 0 and 1,
respectively. Starting with r1431, both have road_speed=1. Could that be
the source of the breakage? If it is (please test road_speed=0 on
highway=path in the current default style), then I would change the
default style so that highway=path & bicycle=(designated|official) gets
road_speed=1 and all other highway=path get road_speed=0.
Best regards,
Marko
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