For the purposes of this article, the following terms, phrases and their derivatives shall have the meanings given herein:
A designated roadway segment within up to a half-mile radius of a school for any of grades pre-K through 12 where school-related activity occurs, including travel by students to or from school on foot or by bicycle and the dropping off or picking up of students by school buses or other vehicles.
A device with one or more motor vehicle sensors producing recorded images of motor vehicles traveling at speed at least 12 miles per hour or more above the posted speed limit.