[mkgmap-dev] Possible maxspeed patch

Wed Aug 26 20:07:49 BST 2009

On Wed, Aug 26, 2009 at 04:37:37PM +0100, MarkS wrote:
> Here is a possible patch for maxspeed.
>
> Around here lots of roads have been tagged with their speed limit (which  
> is 60mph). However, these are unclassified roads and you are unlikely to  
> get above 40mph. At the moment the default behaviour of mkgmap is set  
> overide the style file for these roads and set the road class  
> appropriate to 60mph, which is too fast.
>
> I could turn on ignore-maxspeeds which would fix these roads but in turn  
> that would result in the trunk roads in town getting too high a speed.
>
> The patch attempts to overcome this by offerring an extra option for  
> ignore-maxspeed, so the options become

Wouldnt it make sense to make it possible to apply factors based on road
class to the maxspeed setting?

e.g unclassified -> maxspeed*0.6 
    tertiary -> maxspeed*0.8

OTOH this should all be the responsibility of the routing engine
and at the moment as i understand we abuse the maxspeed (OSM) to set
an "average speed" in the Garmin dataset - not something like a 
speed limit which is obviously broken anyway and just some
idea to make use of the maxspeed ...

Flo
-- 
Florian Lohoff                                         flo at rfc822.org
"Es ist ein grobes Missverständnis und eine Fehlwahrnehmung, dem Staat
im Internet Zensur- und Überwachungsabsichten zu unterstellen."
- - Bundesminister Dr. Wolfgang Schäuble -- 10. Juli in Berlin 
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