Hello,
The school zones data available on Open Data is based on each school, and I believe this was requested by a specific group within the TfNSW cluster.
However, in some instances, a single school zone (ID) may cover one or more schools (one-to-many relationship). In such cases, the school zone ID will be the same for those schools.
On the other hand, our actual speed zone data, which is also available on Open Data, does not contain any duplicate zone IDs.
Users can download the speed zone data and apply a filter with zone_type = school to export the school zone data without duplicates.
Let me know if you need more information.
Regards,
Balaji Subramanium
Open Data Systems