Warning on Port Headland-Karijini road

At the beginning of the road from Port Headland to Karijini National Park there should be a sign big enough to be read by anybody attempting to cross it, saying:
1-This road belongs to mine companies
2-You are on your own, we do not accept complaints
3-Thousands of road trains carrying material 24 hrs per day from mine sites
Then they should add:
4-Most of them overspeeding
5-If you go on on the opposite direction you have to slow down to 60 Kph every time you see one (30 secs or so) otherwise you run the risk of being hit by pebbles on the front, bonnet or windshield of your vehicle.
6-If you stop for the night on one P site, never do it but on a side out of the way because they can go thru it at any speed, park there, you have to breath the sulphur fumes of their exhaust system while they do their necessities, some 10-15 minutes. You might find toilet paper everywhere...
Unless other parts in WA where there are P sites for trucks and P sites for tourists, here there are no signs.
Writing to politicians is a waste of time, I've done it in the past regarding how backpackers fool the system entering National Parks (and council's camping sites without caretakers) after sunset and leaving at sunrise to avoid paying the fees as we responsible citizens do.
Just a warning to fellow caravanners, never felt so helpless in any other paved road in Australia, this road remembered me some old movies of the US far west, the biggest or strongest always wins.