Thanks! They were actually made by the blowing wind. In person, you could see the bits of sand blowing down the beach. The darker sand is from more dense rock (the same rocks that are the outcroppings in this photo). The strong wind blew away all the brown, lightweight sand leaving behind the heavier dark sand. The rock outcroppings to the side and behind helped channel the sand too.
I like that about this photo too. It really guides one eyes into the distance. It lets one imagine more of the story behind this scene
In person they didn't resemble tire tracks in any way. Though maybe that's how they began, and the wind made it look natural. That's my take, though what do I know? I wasn't there to see it happen. Haha
It really was a bizarre place (those are my favorites)