[mkgmap-dev] [PATCH v1] modify road speed and class from a POI

Wed Oct 14 01:03:11 BST 2009

Mark Burton wrote:
> This is something that was briefly discussed not too long ago and the
> idea is that a road's speed or class can be modified by the
> presence of a POI that defines new values for either/both of them. This,
> hopefully, will make ways that have stuff like traffic signals and
> crossings, etc. less attractive to route over.
>
> The values are specified using mkgmap:road-speed and mkgmap:road-class
> tags added to the POI.
>
> These tags expect an integer value, optionally preceded by a + or -
> which make the adjustment relative to the original value.
>
> For example, mkgmap:road-speed=3 sets the speed to 3 and
> mkgmap:road-speed=-1 reduces the speed by 1 from whatever value it had
> before.
>
> Here's some possible rules for the points file:
>
> highway=traffic_signals { add mkgmap:road-speed = '-1' }
> highway=crossing { add mkgmap:road-speed = '-1' }
> highway=mini_roundabout { add mkgmap:road-speed = '1' }
>   
Wow that sounds really great!
Will try it out tomorrow. Especially increasing it based on points 
sounds great

is road-speed a typo? Should it be road_speed?

Is it really the POI that introduces this change on the unit, or is 
mkgmap changing it based on the compile process?
I would never have thought that Garmin takes POIs into account when 
routing (will also have to see whether this works on all units in case 
it is not mkgmap).

This will really help to make city streets less attractive and pathes 
and footways that are outdoor more attractive (fewer traffic_signals, 
crossings, etc...).
> The region of the way that has its speed/class modified is limited to
> the closest points either side of the POI. Not sure if that's the right
> thing to do yet. Needs playing with.
>
> You need to specify the --link-pois-to-ways option to enable this
> functionality.
>   
The link-pois-to-ways adds no access restrictions if not specifically 
given in the style-file, does it?

Thanks for the last two mails, both really good things to get better 
routing!
> All feedback welcome.
>
> Mark
>   
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