Page 17. The number of arrests for drink/drug driving offences in 2023 was 3,145 resulting in 2,978 drink/drug driving offences being referred for prosecution, with the worst offender being almost 5 times over the limit (Table 9). This is an increase from 2,959 arrests and 2,789 offences referred for prosecution in 2014, an increase of 6% and 7% respectively. Drink/drug driving continues to be a major contributor in fatal and serious injury road traffic collisions as ‘impaired by alcohol/drugs – driver/rider’ was the 2nd most common principal causation factor for KSI casualties between January and November 20235. Further analysis identifying issues and trends in relation to fatal and serious collisions caused by drink driving has been completed by Department for Infrastructure.