The TSNI started in 1999 and is based on the National Travel Survey run by the Department for Transport. Three years of data need to be combined to ensure the analysis carried out is robust. Further information can be found on the DfI website
The TSNI collects information on how and why people travel within Northern Ireland. The in-depth report is produced annually and contains more detailed results. Due to significant changes to the survey methodology because of the COVID-19 pandemic, the 2020 survey estimates are reported as a single year instead of the usual three years combined and the results are not directly comparable to those from previous years.
Travel Survey NI: 2020