What can be labeled as unsafe passing in Iowa?

Passing in a no-passing zone is considered unsafe in Iowa because these zones are specifically designated areas where overtaking another vehicle is prohibited, usually due to visibility issues, road conditions, or proximity to intersections. The intent behind these regulations is to ensure the safety of all road users by preventing risky maneuvers that could lead to accidents. No-passing zones are often marked with signs and are put in place for the protection of drivers, cyclists, and pedestrians, reinforcing the state's commitment to road safety.

In contrast, passing at a controlled intersection, passing a vehicle traveling slower, and using turn signals before passing are actions that, when performed under the right conditions, do not inherently violate any traffic laws or safety protocols in Iowa.