You agree that if a router has two possible roads to take between two
cities, and one is a trunk, and one is a primary, and all other
things
are equal, that the router should choose the trunk, right? Doesn't
that make trunk, by definition, the primary non-motorway route
between
two cities?
Only if trunk has a meaning that implies that a road tagged trunk is
somehow better than a road tagged primary, which it apparently does not,
at least in some people's minds. If you're going to waste trunk on curvy
two lane roads, a router may as well use distance or maxspeed as a
better metric. As it stands, some of us are using trunk as more of a 'I
know it when I see it' thing than something useful for routing purposes
like motorway.
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