I've been parking there for years, and have been there a few times with no issue since they added the railings.
However, I got yelled at by one of the locals yesterday. She was nice enough to stop her car and tell me that the railings are there for a reason, and I shouldn't park there and pay at the Park like everyone else. She then proceeded to call me some names. Nice folk up there.
Not sure if there was an incident at that spot or something that prompted the change, but looks like we gotta find a new "free" place to park.