1. Statistical Pocketbook 2021. EU Transport in Figures. Mobility and Transport,2021
2. Synthesis of the Results of General Traffic Measurement 2020/21 on the Rural Network of National Roads,2021
3. Synthesis of the Results of General Traffic Measurement 2020/21 on the Rural Network of Voivodeship Roads,2021
4. The Local Data Bank;Central Statistical Office
5. Global Traffic Scorecard Reportwww.inrix.com/scorecard