What are the series of random-ish colored dots in the N, S, E, and W streets?

The scale seems a bit odd. Your entire city is not even close to a mile across according to your scale, which seems odd for an "Imperial City." It also seems like there are a ton of houses packed together for a span of 400 feet. I am aware that a lot of these are hovels for the poor, but still. . .

There are very few roads for a whole city, and the ones that ARE there are REALLY WIDE.