[Tagging] What classification for a connecting link?

[Nathan Edgars II]

So a trunk road crosses a primary road, but you're not allowed to turn
at the crossing. Instead you have to turn before or after and loop
around to get from one to the other. If this connecting status is the
sole reason through traffic would have for using the road, how should
it be tagged? trunk? trunk_link? primary? primary_link? Does the
presence of residential driveway access (in other words it would be
residential were it not a connection) make a difference? Is it ever
appropriate to leave it residential or tag it something else below
primary, despite its use as a connection between trunk and primary
highways?