How to tag "access roads" to public ferries?

[rumbrummer]

Because some routers consider this tags (that is the intention of those tags).
And e.g. Kurviger shows roads tagged with highway = service, service = driveway as potentially blocked:

Highway = service = driveway pot. blocked

In the short route https://kurv.gr/4FEx8 there are two gas stations as viapoints. Both of them are shown as potentially blocked roads - perhaps because the ways are tagged with highway=service and service=driveway. Tagging access=customers does not help. https://www.openstreetmap.org/way/356650185 https://www.openstreetmap.org/way/361377745 From my point of view it is not useful to report that as potentially closed road - especially because viapoints are placed there.

So correct tagging is important for several routers.