Normally I would say the ranger needed more dune training.
And since "Whistle Blowers" all seem to die in single car accidents,
I'll not call BLM or the ranger station.
There was a movie called "Up the Down Staircase" that had the
same issues.
On a related note, I was in a "Head On Collision" at Pismo.
The main "Sand Highway" was marked with pylons in the center.
I was on the correct side, the other, not so much.
I was hit and needed a new front "Spindle Mount" wheel.
The other guy agreed to buy me one.
Since those days, I try to be careful.