# Five years of collisions

> Fatal, serious and slight, held apart so the serious ones stay visible.

- Category: Transport
- Cadence: annual
- Status: Published on a annual cadence.
- Dataset key: `collision-trend`
- Source: [Department for Transport](https://www.gov.uk/government/statistical-data-sets/road-safety-open-data)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/collisions-over-time](https://londongraph.com/g/collisions-over-time)
- Machine-readable record: [https://londongraph.com/data/collisions-over-time](https://londongraph.com/data/collisions-over-time)

## Methodology

London police-reported personal-injury collisions by severity in the latest five-year DfT STATS19 files. Series remain separate because slight collisions vastly outnumber fatal collisions. Publisher provisional status is retained rather than silently mixed with validated annual data.

## Visualisations

- [Trend](https://londongraph.com/g/collisions-over-time): Fatal, serious and slight, held apart so the serious ones stay visible.
- [Change](https://londongraph.com/g/collisions-over-time?view=change): Show the change from each preceding published period.
- [Share over time](https://londongraph.com/g/collisions-over-time?view=share): Normalize each period to show how the mix changes.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.