# Melbourne TIRTL Data Dictionary

Generated: 2026-05-24T16:12:33
Version: v3

## Important terminology

Important terminology: in these outputs, 'vehicles', 'vehicle movements', 'trucks', and 'truck movements' refer to classified sensor movement records or passings. They should not be interpreted as the number of unique vehicles or unique trucks in Melbourne.

## Summary

- CSV files catalogued: 16
- Column rows profiled: 238
- Priority datasets: 16

## Dataset categories

- Change / comparison summary: 1
- Daily network trend: 1
- Import / manifest / audit: 1
- Map layer / geospatial: 1
- Monthly network trend: 2
- Site master / lookup: 4
- Spatial join / locality lookup: 1
- Suburb/locality truck intelligence: 1
- Truck movement ranking: 2
- Truck-share ranking: 2

## Release-status groups

- Good public release candidate: 10
- High-value public summary; consider keeping full CSV controlled: 2
- Public methodology / technical appendix: 4

## Highest priority datasets

1. `tirtl_top_truck_share_sites_enriched.csv` — Truck-share ranking — score 95
2. `tirtl_top_truck_sites_enriched.csv` — Truck movement ranking — score 93
3. `melbourne_tirtl_truck_map_layer.csv` — Map layer / geospatial — score 81
4. `tirtl_top_truck_share_sites.csv` — Truck-share ranking — score 72
5. `tirtl_top_truck_sites.csv` — Truck movement ranking — score 70
6. `tirtl_suburb_truck_summary.csv` — Suburb/locality truck intelligence — score 68
7. `tirtl_site_locality_lookup.csv` — Spatial join / locality lookup — score 54
8. `tirtl_daily_summary.csv` — Daily network trend — score 53
9. `tirtl_monthly_network_summary.csv` — Monthly network trend — score 48
10. `tirtl_monthly_network_summary_export.csv` — Monthly network trend — score 48

## Notes for journalists

The TIRTL outputs are best understood as classified movement records from traffic sensors. A single vehicle may generate multiple records if it passes multiple sensors or appears in different site-heading records. Therefore, vehicle movements and truck movements are not unique vehicle counts.

## Notes for future ChatGPT workflows

Upload the files in this data dictionary folder when asking ChatGPT to design new TIRTL pages, dashboards, maps, journalist packs, or commercial data products. The priority datasets CSV gives a quick summary of what is available.