The CityTrafficSimulator update to version 0.6-6 is online.
The most important change ist the new scrolling algorithm: In order to remove the former canvas size limit it was necessary to get rid of the scroll bars and implement new scrolling metaphors. Changing the currently visible part of the network is now done by drag and drop with the right mouse button. At first, this might occur less intuitive to you, but once you've get used to it, navigating through your network becomes much easier and faster.
The new network canvas code also allows some new comfort features: The Canvas Setup tab now shows the world coordinates of the current mouse position (in meters) and allows to setup the rendering of an auxiliary grid.
Further changes of this update include some improvements in the network layer code and fixes a possible null-reference exception when a node had no assigned network layer.