67 Pa. Code § 447.2
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
Elementary students-School students in kindergarten or grades one through six.
Hazardous-An unsafe condition caused by potential incompatability between vehicles and school students, while the students are walking between their home and their school or school bus stop.
Safe-running speed-The official speed limit as posted by signs or, in the absence of a posted speed limit, the average speed as determined by making a minimum of five test runs in each direction and periodically recording the operating speed at different locations while driving at a speed which is reasonable and prudent considering the spacing of intersections, roadside development and sight distance.
Secondary students-School students in grades 7 through 12.
Shoulder-The portion of the highway contiguous to the roadway used for accommodation of stopped or parked vehicles, for emergency use or for lateral support of base and surface courses.
Sidewalk-That portion of a street or highway or other public right-of-way which is reserved exclusively for pedestrian travel and is normally protected by a minimum average 4-inch high, nonmountable curb, or is not immediately adjacent to the roadway. A sidewalk should have a minimum width of 2 feet; a gravel, brick, stone or paved surface; and be available for use during normal weather conditions.
Student walking route-The system of streets, shoulders, sidewalks and crosswalks used by school students when walking between their home and their school or school bus stop, officially designated by the school district or, where no official route has been designated, used by school students because of the unavailability of a reasonable alternate route.
67 Pa. Code § 447.2