[Tagging] How to tag a (main) entrance to a large feature?

[Mike N.]

>> http://wiki.openstreetmap.org/wiki/Proposed_features/entrance

> That however doesn't help in a case where a public road cuts through
> the park. How do we indicate that a specific entrance road is the
> correct one to use to enter the park by car if you want to spend time
> walking in the park?

  Better than than barrier=entrance,   I think entrance= is a better tag: 
for a park, this would be "main" or "visitor", although some parks have 
multiple visitor entrances.