Fiction and Non-fiction Indistinct in Some Cultures

Think about a two lane road. In the U.S., if there is a dotted line down the middle, cars coming in either direction can cross over the line to pass a slower vehicle, assuming the coast is clear.

Now think about the same road on more difficult terrain.  There are two lines in the middle, one solid and the other dotted. If the solid lane is on your side, you can't cross it. But if you are driving on the side with the dotted line, you can.