I've been in multiple presidential and foreign heads of state motorcades. From that perspective it's fun being able to go from one end of the city to another without having to make a single stop.
A point and shoot with an iPhone, taken in the Tehachapi Mtns. California, on my way home. I was listning to Aaron Copland's "Fanfare for the Common Man" at the time. That was a very powerful and moving combination.
There are many theories based on location, orientation, shape, etc. They are mainly educated guesses. Attached is a great video (not me, not taken by me) of that particular panel that might answer your question...or pose many new ones.
I apologize; it's a lack of clarity on my part. There are many sites in that region that were carved at various times beginning about 8K years ago and ending about 1K years ago. Based on the amount of "revarnish" in the photo above, that particular panel is closer to the latter.
It's carved into very hard volcanic rock and will last for many more centuries. The greatest threat to them is Man. The exact location of these sites is by law, never revealed to the general public.
This petroglyph is located in the Volcanic Tablelands of California, and is thought to be between about 1000 and 8,800 years old , and possibly made by the ancestors of the native Paiute-Shoshone people who still inhabit the valley. The style of the petroglyph is classified as Great Basin Curvilinea