Does anyone know what this triangle is in the Arizona desert?

Look at this site.
Reference

Scroll down near the bottom of page.
Old WW2 airport.

It says Toyota Proving Ground on the map, by I have two other guesses: either a UFO landing strip or an angel dropped a musical triangle. What is the name of that instrument?

I tried to post an image, but it failed.

quote:

Originally posted by VelvetVoice:
It says Toyota Proving Ground on the map...

Toyota's Proving Grounds is what I was searching for. It's about 7 miles west of the triangle.

quote:

Originally posted by VelvetVoice:
What is the name of that instrument?

It's called a, *cough*, a triangle.