I thought that all routes are concurrent but I wasn't 100% sure when I posted it and I was too lazy to check it yesterday...
I've checked it now and
ALL nzlmot routes are concurrent to the in-devel nzlsh system.
I absolutely agree that we don't need a system which is 100% concurrent to another (future) system but Si has gone this way in Europe too. Norway, Denmark, Sweden, Finland, Lithuania, Estonia, Latvia, Belarus, Russia and Ukraine do not have a motorway network with own numbering but they have national roads signed as motorway. If you compare different regions, these countries have no "blue" (tier 1, motorway) color which looks odd. For that reason, Si also drafted these routes as
eursf ("teal", tier 2, Select Freeway). In countries with own motorway category, e.g. BGR, BIH, CHE, DEU,... eursf routes are freeways which are
not concurrent to any other system.
I'm not happy with the solution but I wanna be able to distinguish motorways and "simple" national routes. One the map with a different color and even in stats. It's one reason why I've recently opened a thread about
tiers on the internal board. nzlmot would be tier "1E".