I was swinging past SEA one morning and, as I got closer, the sun was not much above the horizon and still below a solid cloud layer. I could see that departing planes were catching the light really well and diverted off my planned route to see if I could get a couple of shots. Things immediately went wrong as I got in a turning lane at the lights behind a coach. Two long cycles of the lights without our filter arrow turning green ate a ton of time up.  I eventually pulled out and turned right instead of left before making a U turn and coming back the way I originally wanted. By this time, I had missed a few interesting departures. I did get one Alaska 737 as it climbed out but, by the time it was level with me, it was in shadow. The next departure was almost totally shaded. The sun had risen enough to go behind the cloud bank. I went on my way, but I could have had some gorgeous light if the signals hadn’t screwed things up.