Although kids don't go back until Monday, school zones operate from Friday.

School zones operate on gazetted school days. Gazetted school days can be seen at:

http://www.rta.nsw.gov.au/roadsafety/children/schoolroadsafety/schoolzoneprogram.html

These school days include School/Teacher Development days. These are days when students do not attend. It is a day when teachers make ready for the upcoming term.