Statistical data set

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

Name: Average speed, delay and reliability of travel times (CGN)
Creator: Department for Transport
Published: 2018-07-19T00:00:00+01:00

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 August 2026

Show all updates

6 August 2026
Added tables for Great Britain, Scotland and Wales, and added data up to March 2026.
14 May 2026
Data tables for Travel time measures for the Strategic Road Network and local ‘A’ roads: 2025 published.
10 December 2025
Data to September 2025 have been added
2 October 2025
Data to June 2025 has been added
26 June 2025
Inclusion of data for January to March 2025
6 March 2025
Data added to include information up to December 2024
5 December 2024
All tables have been updated to include data to September 2025.
3 October 2024
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.
27 June 2024
Data up to March 2024 has been added to all tables.
7 March 2024
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.
13 December 2023
The latest data for October 2023 through September 2023 have been added to the data tables.
27 September 2023
Data tables updated for the latest release.
14 June 2023
Data tables have been updated to include data up to March 2023.
9 March 2023
The tables have been updated to include data from January 2019 to December 2022
14 December 2022
Data tables updated for the travel time measures for SRN and local 'A' roads for October 2021 to September 2022.
8 September 2022
The tables have been updated to include data up to June 2022.
29 June 2022
Data tables updated for the travel time measures for SRN and local 'A' roads for April 2021 to March 2022.
2 March 2022
Data tables updated for the 2021 travel time measures report.
14 December 2021
New data tables created to reflect changes to the data provider.
8 July 2021
Data tables updated for April 2020 to March 2021 travel time measures report.
25 February 2021
Data tables updated for the 2020 travel time measures report.
3 December 2020
Data tables updated for year ending September 2020 statistics release.
16 September 2020
Data tables updated for year ending June 2020 statistics report.
18 June 2020
Data tables updated for year ending March 2020 statistics release.
5 March 2020
All data tables updated for the 2019 travel time measures report.
19 September 2019
Updated tables for 'Travel time measures for the Strategic Road Network and local ‘A’ roads: July 2018 to June 2019'.
13 June 2019
Data tables updated for the April 2018 to March 2019 statistics release.
28 February 2019
All data tables updated for the 2018 travel times report.
13 December 2018
Data tables updated for the year ending September 2018 report.
20 September 2018
Data tables updated for the year ending June 2018.
19 July 2018
First published.