MMO: world design

It's interesting to observe world design of MMO, since many real world experience or concepts can be applied to the virtual world. For example, City of Gahlen has a COT (center of town), and the crossing roads are Great way towards the castle at the north, Middle street lies on the East-West direction. Then High street is the next one located at the north, and Lowen street at the south. What a good practice for simple city design.