Also, if there are two side-by-side traffic lights at the intersection that is also an indication that the road can handle two lanes, whether or not lines are painted. The real problem is motorists who aren't attentive enough to bear over to one side or another because a line isn't drawn. If the road is of a certain width it should be obvious that it isn't just one extra large lane, and two lights instead of one is another clue.

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