What constitutes a "business district" according to traffic definitions?

A "business district" is characterized by areas that are primarily used for commercial, retail, or other business purposes, rather than residential or recreational uses. The definition often includes specific criteria, such as the presence of a significant number of business buildings within a certain length of roadway.

In this case, the correct choice identifies a segment of highway that is at least 600 feet long and lined with business buildings, which aligns with the traffic definitions used in various transportation codes. This length and type of development indicate a concentrated area where commercial activity occurs, thereby making it recognizable as a business district.

The other options describe areas that do not reflect the primary function of a business district. For instance, areas exclusively for residential purposes or neighborhoods that contain schools and homes do not qualify as business districts, as their primary use is not commercial. Similarly, regions with parks and recreation sites are focused on leisure and public space rather than business activities. Therefore, the definition of a business district is specifically aligned with commercial developments found along a designated segment of highway, making that choice the accurate one.