Create a loop road
Every loop must be made up of three or more segments. Any loop that does not follow this rule can cause problems for the Waze routing server. If there is no side-street, you must insert an extra junction node along the loop.
If you have to correct a loop road with less than three segments, cut one of the looping segments somewhere, following the instructions in Cutting a segment and check the Junction Arrows.
Please note, a real loop road should only be sparsely used with care. For more information, see the article Loops in the global Wiki page Junction Style Guide.