Rentahamster
Rodent Whores
Ok, here is the road design layout I've been working on.
I haven't tested it yet on a wide scale, but it essentially keeps traffic moving at all times in your city.
This is a paired down version for simplicity, just using one block for each road segment. In reality, I would probably use 2-3 blocks for each segment. Since this is paired down, you may also notice that the citizens living on the outside will be able to feed back into the system, will be naturally taken care of as you expand the system out.
You have some one ways leading into a two way, like on the bottom right corner. That means the lane going down on that two way will never be used. You might as well have that one be a one way too.