That's an understatement
A sign - encased in actual lava, no less - stating that the Chain of Craters road is no longer open beyond this point. The sign was probably placed there prior to the actual encroachment of this lava, back in 1986.
This image is from the presentation "A Hawaiian Kaleidoscope - The Big Island: Volcanoes, Mauna Loa Climb, Heiaus and Beach Relaxation".

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