[OSM-talk] question for folks working on routing engines

[Elizabeth Dodd]

On Fri, 15 Apr 2011 10:36:55 -0400
Richard Welty <rwelty at averillpark.net> wrote:

> this occurred to me while surveying speed limits in a somewhat rural
> part of the US.
> 
> are any of the routing engines looking at the surface tag as part of
> their decision making?
> 
> i ask this because in NY, the default speed limit in rural areas is 55
> on all roads. there are numerous unpaved roads (dirt, gravel) which
> do not have posted speed limits, but where driving at 55 is not
> reasonable unless you're a rally driver and the road is closed.
> 
> i want to tag these accurately, and am doing so, but i should think
> that the routing engines ought to avoid, when possible, this
> combination or others like it:
> 
> highway=unclassified
> name=Mead Road
> maxspeed=55 mph
> surface=dirt
> 
> richard
> 
Navit considers the highway type and the surface type. Exactly what
speed you expect to do for those parameters is user configurable in a config file.