NaumMAS

about the graphic bug in the first image I've never seen anything like this before. I also have no idea why the game does not let you zoning on the common road. I hope you can find a solution, good luck.

The problem of not being able to do tunnel, as far as I know is a problem of the game in itself. There are some maps in certain regions that it is impossible to make tunnels for some reason. I do not know why, but seems like some maps of SimCity 2013 have been done in a way that tunnels have become impossible to do. unfortunately, it seems that regional bridges can not be raised or lowered. From what I know the reason is because the terrain outside the normal SimCity map is not fully programmed. Some functions do not work outside the normal map.

In the situation where the houses are disconnected from the region the problem is very simple. Look closely at the image you posted and pay attention to the direction the arrows on the UDON mod roads are pointing. saw the problem now, the traffic can enter but can not leave because of the direction that the One Way Roads are pointing so the game says that it is disconnected from the region. I made that mistake too when I started using this mod.