I've been looking into lighting my buildings and later cars & Trucks but nothing to the fantastic extent you have !!

Great work and I'm looking forward to your video of the lighting effects in action.

If you turn the center of your bridge into and accident scene with un-lit cars blocking the Bridge and a few people standing out of their cars looking, it will give a good reason why the lighted cars and truck don't move (with or without emergency vehicles) on the scene. This was just  an Idea I had when I was looking at your bridge and thought the only thing missing is movement or a reason why nothing was moving otherwise it will still look great with what you've already done.

Thanks Dan!  The arduino control is another level but it's not as hard as it seems.  Makes a neat effect even if it's daylight most off the time on my layout.  The building next to the bridge was lit tonite, just lights look all the time though.