R: [mkgmap-dev] road_speed parameter

Wed May 27 19:15:41 BST 2009

Thank you!
Thanks to Norbert, too.

Maybe, we should add this knowledge to the Wiki as soon as there are concrete results.

Is it possible that this speed information is ignored in case of bicycle or pedestrian routing? How can I prefer special road classes for bicycles?

Markus

-------- Original-Nachricht --------
> Datum: Wed, 27 May 2009 14:04:29 +0000 (GMT)
> Von: Marco Certelli <marco_certelli at yahoo.it>
> An: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>
> Betreff: R: [mkgmap-dev] road_speed parameter

> 
> 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 at gmx.eu <gypakk at gmx.eu> ha scritto:
> 
> > Da: gypakk at gmx.eu <gypakk at gmx.eu>
> > Oggetto: [mkgmap-dev] road_speed parameter
> > A: "Development list for mkgmap" <mkgmap-dev at 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 at lists.mkgmap.org.uk
> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> > 
> 
> 
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