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