If you have high fill or deep cut at a road intersection you might get so called "bow ties":
To fix this issue, you can either use grading objects, or you can create an additional surface at the bow tie region from polylines and feature lines. The second option is used in the video below as there is no need to deal with the grading tools:
Video link (also available in the video library):
The image below shows the fixed bow ties and final surface on the right-hand side:
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