One stupid thing I noticed about this map is that the north contains a lot of small dots. They are caused by the fact I have cut and pasted this map together in Paint Shop Pro and I forgot that my grid was on in City Designer 3. A mistake I made in several of my maps.
To remove the dots I will have to cut and paste most of the map again, which will take probably an hour. But as the dots can't be seen unless your really zoom in and because of the fact I am pretty lazy, I haven't redone the map yet. But I will do a proper version some time.