The gravel pit operates on weekdays (most weekdays) and I have driven in many times. I always stop at the office at the entrance and try to get permission. Sometimes there's someone there, sometimes not.
Be sure to observe the speed limit if you're driving down to the hole.
If you think the Lami-lecture is a pain, wait til the foreman lectures you on your driving! rolleyes
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If you leave things up to interpretation, there's no room to be right.