Hello,

To open it for a larger audience please let me share my question from the osm 
wiki:
https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dservice#service_vs._unclassified,_conflicting_definitions

Quoting:

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service vs. unclassified, conflicting definitions

There are some discrepancies between this page and highway=unclassified, and 
the wording leaves a lot to interpretation and opinions.

This page suggests that service is a road which ends on some feature with no 
through traffic (leading to a building, a parking place, etc). Is is also 
specifically exclude frontage roads as an example to tag according to function 
and not purpose. By following this definition a road with throughfaring traffic 
(where both end is open, connecting to other roads or tracks) cannot be 
service, so it should be unclassified.

However unclassified declares itself as "considered usable by motorcars" and 
also "In rural contexts, narrow paved roads with only private access for 
motorcars (maybe public access for agricultural motor-vehicles, cyclists and 
pedestrians) should be tagged as highway=service and motorcar=private (maybe 
motor_vehicle=agricultural)", suggesting that unclassified requires to be 
motorcar=yes and suggests that "narrow paved roads with motorcar=private" 
should be tagged as service.

These definitions quite contradict one another.

Take a pretty common road type in Europe, which goes on the embankment of a 
river, which generally paved, narrow, legally open for walking and bicycling 
people, often part of the national/international bicycle-road network, and 
closed for motorcar traffic (usually only waterworks' cars are allowed). What's 
that? Cannot be "unclassified" since motorcars aren't allowed, cannot be 
service since it doesn't "leading to something". Some people tag it this way, 
some that way. That's not good.

Either service should mean "one level below unclassified" and soften the 
wording even more ("generally" to "in many cases", for example), or 
unclassified shall drop requirement for motorcars and suggesting service for 
"narrow paved roads w/ private motorcar access". I'd support the latter: I 
would rather use unclassified here, but that's an opinion.

Your inputs are welcome. 

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Here, as well as there.

Thank you,
g

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