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Things EVERY editor SHOULD know.
All roads are made up of 1 or more segments.
Segments are connected by 1 or 2 nodes (junctions).
When you select a segment you can see which turns are allowed at its nodes. Green indicates you can turn that way, red, you can't. Simply click on the arrow to turn it from green to red or vice versa. (If you select more than one segment at a time, the turns will not be displayed.)