I agree with posting the signs.  My children used to go there often with their friends when they were just able to drive.  If I had known how dangerous it was, I would have warned them not to do it or take extra precautions.  Now I hear many stories that have never been told until now about close calls which they saw or have experienced.  There needs to be a warning sign.  The same hold true about the back side of the Mokuluas.  I have asked the DLNR to put warning signs up but they claim they would be liable if they admit it's dangerous and they aren't able to enforce.