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' }
Seems to work quite well. This way you can slightly increase the
priority of secondary/tertiary streets on the countryside while
avoiding them inside big cities (only if they are very well mapped). I
do suppose other people will find other uses for this patch.
Only problem that I did not manage to apply it to the mdr branch
(neither the tweeze-arc patch).
It would be great if one could define minimum settings as mentioned
elsewhere, because if road_speed decreases from 1 to 0 the change is
really drastic. Great would be to be able to do things like the
following { if road_speed >1 add mkgmap:road_speed = '-1'; if
road_speed=1 add mkgmap:road_class = '-1' }.
P.S. all the branches and patches outside of the trunk really make it
difficult for me applying patches without breaking stuff. IMHO the mdr
branch should be committed to trunk soon (because it is an essential
feature and does not break anything), and also the "continue" patch
should be merged to trunk, because many people are using it and it is
very prone to break ....
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