[Tagging] Tagging barrier open to disabled, plus some visitors?

[Bryce Nesbitt]

How do I best map a barrier that is:

* Open to any vehicle with a disability placard
* Open persons walking or cycling
* Open to visitors with reservations.
* Open to park personnel
* Closed to every other type of vehicle.

(This is at Point Cabrillo Light Station, California.  During my visit, I
was misled by OSM as to the walk distance, as OSM showed an apparently open
parking lot
that in fact was only open to the disabled).
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