GRJ, they would have to be getting them made pretty cheap to be able to sell at such low prices, unless they are making little or no profit and doing this just for fun like I am (I think that's a long shot).
Stan, I think you are exactly right about the CC-CA selection, I was not reading it correctly. Your description makes more sense too. As for the 120vac module, I won't be using it. I much prefer the low voltage stuff, less chance of electrocuting myself! 
I do appreciate you explaining the way everything operates and the components used. I still find all this interesting and like to learn about the different methods for doing these things. I can see where a circuit designer might even have 'too many' options. I could see myself getting stuck in this area. The solid state relays are something I might investigate too, I like the 'quiet' part and they would be interesting to experiment with and I don't have any so more stuff to order. 
To add even more to this... I just got an email from We_Honest including one of their traffic light controllers. Costs more than the one above ($24.99), but does some different things. I saw some of their items when I ordered my traffic lights, but I missed this one " 1 x Model Railroad 4-ways traffic signal light controller simulator 4 directions " (for searching). Also they apparently have a traffic signal with additional 'red & green' lights for pedestrians, along with the regular signals. Missed that before too. These things seem to be popping up all over the place! 
