Lava is HOT!, Hawaii (Big Island)
As everyone knows, the temperature of molten lava is extreme. Even if it is not "red hot," recent lava flow can also be hot just beneath the surface and certain types of cooled or hard lava can be extremely sharp, jagged and slice through skin and shoes. You are advised to wear hardsoled shoes when tranversing any cooled lava flows and just don't even go near the other type!
This sign has a powerful message, heed! An exploding lava rock hit this sign, which now has a double message, as well as a burned surface. Of course, this sign was once closer to the edge, but moved as lava covered the road. Cooled lava surfaces sometimes have "pockets" and can shift, becoming very dangerous to careless travellers.
I hope no one was disobedient at this time! This is part of the road where Kilauea decided to cover the path to ensure the "No parking" laws were enforced. Lava flow was in April 2003.