On Wed, Feb 20, 2019 at 09:39:00AM -0300, Fernando Trebien wrote: > Applications expect each level of the street mesh to be as complete > and connected as possible. Some routing engines (especially older > engines and software running on embedded devices with low CPU/memory, > not the case of OSRM and GraphHopper) employ heuristics that > prioritize following streets of higher classification first. In that > sense, highway=unclassified would work like a level between > residential and tertiary, that is, this kind of routing engine would > avoid computing routes through residential streets unless it cannot > find a route using higher road classes. So if an highway=unclassified > route is interrupted by a string of highway=residential in an urban > area, the engine will avoid considering the through route, it will do > so only after exploring all other alternatives of higher class, and > that may result in a much larger route around that area in the highway > mesh.
This is only under the assumption that unclassified is indeed something
"better" than residential which from the original tagging it isnt.
From the original meaning unclassified was the lowest class road in
rural or off city limits. residential was the lowest class road within
city limits. (Assuming that city limits mean residential usage)
Now the German Wiki pages states otherwise - not explicitly that
unclassified is something better but by assuming rules on where to
use it which are contrary to the original meaning of unclassified which
makes users THINK thats its something better.
From OSRM profiles it isnt - So it doesnt make a difference for at least
OSRM.
I dont think that language tagging pages which ought to be translations
start their own agenda and push assumptions which are far off the
original - at least without stating so.
Flo
--
Florian Lohoff f...@zz.de
UTF-8 Test: The 🐈 ran after a 🐁, but the 🐁 ran away
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