And of course this varies by state. Note the school bus specification(s).
New Jersey (within 1,000 feet of the property of a specified school, 1,000 feet of a school bus, and 500 feet of a public housing facility, public park and public building
Rhode Island (within 300 yards of the property of a specified school and 300 yards of a public park and playground).
Massachusetts (within 1,500 feet of the property of a specified school and 100 feet of a public park and playground).
Connecticut(within 1,500 feet of the property of a specified school, public housing project, and licensed child care center
Maryland (in a school vehicle and within1,000 feet of the property of a specified school).