You can specify how to create intersections of double lines, and whether cut lines and gaps will occur at the intersections.For example: if you form a clean T-intersection of two double lines at an angle other than 90 degrees, the end of one of the first line will be cut at an angle, and the second double line will have a gap to accommodate the first double line. Cl eanup: Forms a clean intersection. 
If you deselect Cleanup, the first line selected will remain unbroken. 
Dr op CutLines: Removes the cut lines in the first line, to even out the end of the line. 
Dro p Gaps: Fills in the gap in the second line. 
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