At this spot the main highway of the island meets with the road from the port and a road going between the city center and the suburbs. With the port being the only export/import point (there is no external highway connections or rail connections from the island) it sees a lot of traffic, so the main purpose of the intersection was to facilitate a good flow between the port and the northbound highway (there is one more connection to the port further south). Thanks to the Node Controller mod I managed to achieve a rather cool organic design and a nice flow of the lanes. The capacity appears to be greater than that of the roundabout that I previously had on this spot.