Statistical data set

Average speed, delay and reliability of travel times (CGN)

Data on the average speed, delay and reliability of travel times on the Strategic Road Network (SRN) and local 'A' roads, produced by Department for Transport.

From:
Department for Transport
Published
19 July 2018
Last updated
6 March 2025 — See all updates

Average speed, delay and reliability of travel times on SRN (CGN04)

CGN0404: Average speed on the Strategic Road Network in England: monthly and annual averages (ODS, 431 KB)

CGN0405: Average delay on the Strategic Road Network in England: monthly and annual averages (ODS, 380 KB)

Average speed and delay on local ‘A’ roads (CGN05)

CGN0503: Average speed on local ‘A’ roads in England: monthly and annual averages (ODS, 147 KB)

CGN0504: Average delay on local ‘A’ roads in England: monthly and annual averages (ODS, 153 KB)

Contact us

Road congestion and travel times

Email congestion.stats@dft.gov.uk

Media enquiries 0300 7777 878

Updates to this page

Published 19 July 2018
Last updated 6 March 2025 show all updates

  1. Data added to include information up to December 2024

  2. All tables have been updated to include data to September 2025.

  3. Data for April to June 2024 have been added, and revisions have been made to the series following agreements with suppliers to improve consistency going forward.

  4. Data up to March 2024 has been added to all tables.

  5. Data tables have been updated to include data up to December 2023. Over 2023 the congestion statistics processing was transferred to a new software enabling greater precision and accuracy in calculations and imputation of the production of statistical values. This has led to minor revisions for the whole Local 'A' CGN05 time series. A historical methodological error when transferring processing to a new software at the sub-national geography level affected the SRN data. This accounts for the minor revisions in the CGN04 tables b-e.

  6. The latest data for October 2023 through September 2023 have been added to the data tables.

  7. Data tables updated for the latest release.

  8. Data tables have been updated to include data up to March 2023.

  9. The tables have been updated to include data from January 2019 to December 2022

  10. Data tables updated for the travel time measures for SRN and local 'A' roads for October 2021 to September 2022.

  11. The tables have been updated to include data up to June 2022.

  12. Data tables updated for the travel time measures for SRN and local 'A' roads for April 2021 to March 2022.

  13. Data tables updated for the 2021 travel time measures report.

  14. New data tables created to reflect changes to the data provider.

  15. Data tables updated for April 2020 to March 2021 travel time measures report.

  16. Data tables updated for the 2020 travel time measures report.

  17. Data tables updated for year ending September 2020 statistics release.

  18. Data tables updated for year ending June 2020 statistics report.

  19. Data tables updated for year ending March 2020 statistics release.

  20. All data tables updated for the 2019 travel time measures report.

  21. Updated tables for 'Travel time measures for the Strategic Road Network and local ‘A’ roads: July 2018 to June 2019'.

  22. Data tables updated for the April 2018 to March 2019 statistics release.

  23. All data tables updated for the 2018 travel times report.

  24. Data tables updated for the year ending September 2018 report.

  25. Data tables updated for the year ending June 2018.

  26. First published.

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