Here is a quick tutorial on how I did some of the lights. This technique I use for a Sun, Lights on freeway, bridge, even window in a building. I just make th e color and / or shape differently. For example windows would be a square /rectangle, change up the color and value. And you have windows. Dont forget, its not just the light it self that seems to glow. Paint reflective light around it to indicate its hitting something. You can't see it in this version, but in the High Res version I have, I did put some interactive light on the rigging and bridge. Even when it got shrank down, it may not be seen, but its perceived. I took a painted element like this and shrank it down to make it lights on the bridge. Then used Hue / Sat and changed the hue on a few to make it more random and not so copied.
Hope this helps.