Displaying all part of a long road make a big performance hit. So i only display the parts of the roads, which are next to the player. How? As i chopped the Earth into tiles, i also chopping the roads at stage loading along these tiles. I call the part of the road which is on a tile road chunk. This table contains information about the road chunks:

road name
the number of the start point of the chunk
the number of the end point of the chunk

Road Types Table

The list of the available road types. If you select a road type from the list, then its texture will be displayed in the image above this table.

There is a special type null, which is used in case where you don't need the visible stuf only the property of the roads:

makes object density zero, so there won't be placed objects along the road makes ground texture a bit different

More information can be found on the road tab page.