Methodology/Indicators
National-road collision rate
tii.collision_rate
Definition
Injury collision rate on Transport Infrastructure Ireland national-road segments for the frozen 2022–2024 analysis vintage (CollRates_2022to2024, published 20 January 2026, CC BY 4.0). Rate is collisions per 100 million vehicle-km — not a collision count and not local or regional roads. Coverage is the national network only (~1 km segments). This vintage uses AGS data current at the analysis date; later AGS revisions do not rewrite it. Do not stitch older overlapping windows (2018–20, 2020–22) into a trend. High collision location is a segment attribute (Twice Above Average Rate), not a second indicator and not a danger map. Click a segment on the map to select it — segments are not listed in the place combobox.
- Source
- TII table TII-COLLRATES-2022-2024 · Yearly · Open data portal
- Licence
- CC BY 4.0
- Value status
- Official (observed) when ingested · What statuses mean
- Geography
- tii_segment · finest defensible: tii_segment. Not shown below that ceiling.
- Unit
- per 100 million vehicle-km
Caveats
- Transport Infrastructure Ireland national-road injury collision rates for the frozen 2022–2024 vintage (published 20 January 2026). CC BY 4.0.
- A rate (collisions per 100 million vehicle-km) is not a collision count. Coverage is the national network only — not local or regional roads.
- This vintage uses AGS data current at the analysis date; later AGS revisions do not rewrite it. Do not treat older overlapping TII windows as a time series.
- High collision location is a segment attribute (Twice Above Average Rate), not a second map layer.
How to cite
Cite TII table TII-COLLRATES-2022-2024 for official values. Ireland's Dashboard standardises geography, time and presentation.