I have considered this idea in the past...I have a couple traffic lights now. I do plan to add cameras and monitors for the flaggers that have trouble seeing the down sides on the big three, I guess it wouldn't be to hard to add another monitor in the center tower. I do know that some traffic lights can be controlled by IR or by wireless control, but they don't fit in your budget. Nor does trenching in conduit and wires all over the place. NO we aren't hanging wires everywhere either it looks tacky! I do think that having a centrally located system controlled by 1 guy is a good idea. Its just a matter of finding a cost effective means to do it. It doesn't even necessarily need to be a "traffic light" Heck it could be two Bright bulbs, 1 red 1 green. The key is wireless access. But I guess that leads to the next issue, is how many of those can be placed on different signals, will they cross paths: Can you independently control these lights wirelessly?