[EricH]

Originally Posted by Roger

Now you guys have got me wondering. A quick search found me this photo which may exhibit my thinking.

The ends of the field where the drivers are have the big lexan panels. The angled corners are the chainlink fence. The center divider are 3 high lexan panels. The low outside sidewalls have lexan, but the outer outside walls are just the metal pipe - no lexan. At least I can't see any. There are no zip-ties holding the panels anyway, like the center divider wall has. I remember at the end of Final matches before the awards they were taking the pipes down on the audience side but no lexan.

Oh, the OUTSIDE ones! I was thinking of the normal field walls. You're right, those don't have any visible. I'd say that's so refs, spectators, and camera people have a clear view with no chance of reflection.