Thanks Ajax. You're right on all counts, of course. Ok, throw out the possibility of street traffic, but what about air traffic, similar to the stuff you see flying all around Coruscant in Star Wars. Nothing with that kind of detail, of course, but some overlay sheet that can be placed in front of and in between te city blocks might work. Like the Non-volumetric fire and smoke props. 90% of it would be transparent, except for small craft here and there. I wouldn't expect something that would look good really close-up, but even seen from a distance this type of thing could really improve the visual appeal of the city blocks. Thanks again, Jeff