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, gypakk@gmx.eu <gypakk@gmx.eu> ha scritto:
Da: gypakk@gmx.eu <gypakk@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.
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