To effectively communicate the comparative danger of a set of intersections based on the number of accidents, a point plot would be the most efficient representation.
A point plot allows for a clear visual comparison of the accident counts at different intersections, making it easy to identify which locations are more dangerous based on the number of accidents. Pie charts can be misleading when comparing quantities, as they are better suited for showing proportions of a whole rather than direct comparisons. Tables can convey the data, but they are less effective for quick visual impact.
Therefore, the correct answer is point plot.