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Abstract copyright UK Data Service and data collection copyright owner.Northern Ireland Police Recorded Injury Road Traffic Collision Data (prior to 2010 known as the Northern Ireland Road Traffic Collision Data) are derived from information recorded by the Police Service of Northern Ireland (PSNI) in relation to collisions reported to them. The information is captured on a collision report form (CRF) and while there are slight differences between this form and the Department for Transport’s STATS19 form (used in England, Scotland and Wales), the vast majority of the information sought is the same. The main aim of collecting and publishing road traffic collision statistics in Northern Ireland is to provide a basis for assisting the police and government to determine and monitor effective road safety policies to reduce the number of people killed and injured on the roads. Users should note that the data collection form changed format on 1st April 2007. Further information is available in the documentation. Data changes have also taken place over time: from 2011, individual age was replaced with age group. From 2014, the reference id variable changed from string format to a sequential reference number. Further information about the series is available on the PSNI Road Traffic Collision Statistics webpage, alongside the latest User Guide to Police Recorded Injury Road Traffic Collision Statistics in Northern Ireland. Main Topics:The data are divided into three files: Collision: The circumstances of the collisions - details include the collision severity, number of vehicles and casualties involved, time and location, weather and road conditions, and carriageway hazards. Vehicle: Vehicles involved in each collision - details include vehicle type, manoeuvre at time of collision, and data about the driver (age, sex). Casualty: Casualties resulting from a collision - details include age, sex, injury severity and whether a driver, passenger, pedestrian or cyclist.