That's a cool sign
Watch for cracks in the road! Pretty neat. I'm assuming they aren't talking about your garden-variety bumpety-bump type road cracks, but more of the apocalyptic end-of-the-world car-swallowing type road cracks. As seen at Hawai'i Volcanoes NP, Hawai'i.
This image is from the presentation "A Hawaiian Kaleidoscope - The Big Island: Volcanoes, Mauna Loa Climb, Heiaus and Beach Relaxation".

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