This is what I know: Road_speed: 0 to 7
Default values: 7=128Km/h, 6=108Km/h, 5=93km/h, 4=72km/h, 3=56km/h, 2=40km/h, 1=20km/h, 0=8km/h. In Mapsource you can change speeds for levels 2 to 6. My garmin nuvi 255 does not allow any change respect the default speeds. I don't know about other devices. The speed is used for route calculation (shorter time). But for best route calculation, garmin gives also a time penalty to each turn you are required to do in a given route. Road_class: 0 to 4 cGPSmapper says it is the main driver for the route calculation (but does't explain how it is used. maybe is also used to decide if a cross is a turn for you or you are just proceeding on the main road... I don't now but I'll made some experiments Ciao. --- Mer 27/5/09, gyp...@gmx.eu <gyp...@gmx.eu> ha scritto: > Da: gyp...@gmx.eu <gyp...@gmx.eu> > Oggetto: [mkgmap-dev] road_speed parameter > A: "Development list for mkgmap" <mkgmap-dev@lists.mkgmap.org.uk> > Data: Mercoledì 27 maggio 2009, 14:43 > Somewhere in style files there are > road_speed parameters. > Today I know that the speeds for 5 different road classes > can be set in Mapsource. > > I assume that the road_speed values in style file represent > these 5 Garmin road classes. But how does the GPS device > know what speed is referred to by what road class? Is there > a speed table in gmapsupp.img file? > > How can I change these speed values for the GPS device? > > Since these speeds are surely used by the routing algorithm > to weight alternative routes, I would like to get influence > on that, especially for preferring cycleways and residential > streets for cyclists. > > Markus > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev@lists.mkgmap.org.uk > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev > _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev