Final answer:
Passing another vehicle is illegal on hills, curves, intersections, and railroad crossings due to safety concerns.
Explanation:
Hills and curves are areas where it is usually illegal to pass another vehicle. Passing on hills and curves can be dangerous due to limited visibility and control over the vehicle.
Intersections, railroad crossings, and all choices are correct can also be areas where passing is illegal, depending on local traffic laws and safety regulations.
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