I compared different maps and how they route narrow roads.
Soi Chana Songkhram was mentionned What is the recommended tagging approach for routing narrow residential roads? - #11 by ftrebien
This is a max. 2.50 metres wide road tagged as highway=service. The oneway tag is missing in OSM. Way: ซอยชนะสงคราม (550732347) | OpenStreetMap
OpenStreetMap car routing
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Both HERE maps and Google maps avoid this road for car navigation although the Google street car has driven through.
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motorcar=destination could be used for a narrow residential road that routers mistakenly use for transit/shortcut. This is tagging for the router I believe.
residential road or alley?
It does look strange on the map when a 2.5 metres wide road is rendered the same as a regular 5 metres wide road. But that is what HERE and Google also show. I would have liked this solution: highway=residential + narrow=yes. The wiki says that narrow=yes will render waterways smaller. It does nothing for highways.
I usually tag narrow residential roads this way:
highway=path for a road too narrow for a city car
highway=service + service=alley for a road between approx. 2 and 3 metres
highway=residential + lanes-tag for roads of more than 3 metres.
highway=living_street
I don’t use it. I use highway=residential instead