A traffic alert is not a crash statistic: how to read NI road disruption data
PureCar original analysis | 23 October 2026. TrafficWatch reports what is affecting journeys; PSNI injury-collision records answer a different question about historical harm. This report separates recorded evidence from analysis, so readers can understand not only the headline but also the limits of the data.
Two systems that serve different purposes
Drivers checking current congestion, restrictions or roadworks want to know what could change their journey today. Police collision statistics, by contrast, record reported injury collisions and associated casualties in defined historical periods. The difference is essential: a temporary road closure may involve planned works, a breakdown, weather or an incident that injured nobody. It should not automatically be counted as an injury collision.
Why the totals cannot be combined
PureCar’s traffic information pages and its road safety records can complement one another, but combining their raw counts into a single “accidents and delays” statistic would risk double counting and mixing unlike events. Traffic feeds can contain changing incident status, updates and removals; historical collision datasets use their own case identifiers and reporting definitions. A comparison requires explicit matching rules, dates and human review.
What drivers can reliably use
For a journey happening now, current traffic and roadworks information is more relevant than the number of historic collisions near a road. For a long-term concern about a junction, past recorded injury collisions and engineering information are more relevant than the fact that the road was temporarily congested last week. Both sets can guide decisions, but neither offers a prediction that a journey will be accident-free.
The right way to join the research
A worthwhile investigation might ask whether recurring works or disrupted diversions affect traffic flow near an existing collision cluster. That is a hypothesis to test, not a conclusion justified by viewing two maps side by side. Publication should identify the traffic-feed timestamp, collision-data years, matching assumptions and known gaps. Readers can use the live traffic hub for present-day conditions and PureCar’s road reports for longer-term injury records.
A working example of two incompatible datasets
Imagine that a live TrafficWatch feed shows a lane closure on an arterial route today. That record may be created because of planned maintenance, an obstruction or a reported incident; it is not automatically a collision. By contrast, the PSNI annual collision series records injury collisions reported to police, usually after classification and verification. A public alert might later disappear without ever appearing in the annual injury-collision dataset.
A useful PureCar road page should therefore show two clearly labelled panels: “Current reported disruption” with an update timestamp and “Historical police-recorded injury collisions” with its date range. A count of live reports must not be added to a count of historical collisions. Neither should traffic refresh frequency be presented as real-time coverage of every incident.
Practical driver tip: check the timestamp and whether an item describes a closure, roadworks or a collision before changing your route. An absent alert is not a guarantee that the road is clear, and a road with historic collisions is not necessarily disrupted now.
About the evidence
This PureCar analysis uses officially published PSNI and Northern Ireland departmental statistics. The police series covers injury road traffic collisions reported to police; it does not capture every non-injury bump, near miss or unreported incident. A collision is an event and a casualty is a person, so the two totals must not be used interchangeably. The figures are historical and do not indicate conditions on any route right now.
What the figures cannot prove
A higher count in a place or group does not, by itself, establish greater risk per vehicle journey, per mile travelled or per person. The appropriate denominator and road-user exposure data would be required for that conclusion. Nor can the published summary alone establish responsibility for individual incidents. Where this article raises questions about infrastructure, enforcement or road-user behaviour, those are reporting questions unless a cited source confirms an answer.
Explore the underlying information
For local road context, see PureCar’s Northern Ireland road safety reports. For present-day road disruption, use PureCar traffic information. The PSNI road collision statistics library contains the official statistical series and supporting files. Figures can be revised by data owners; for definitive tables and definitions readers should check the official publications directly.
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