Road lengths

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Next update expected:August 2027

Updates

13th August 2026

This update includes the publication of 2025-26 data and some revised estimates for 2023-24 and 2024-25.

21st January 2026
Dataset first published.

Main information

Designation
Official statistics
Data provider
Welsh Government
Data source
Road lengths data collection
Time period covered
April 1995 to March 2026
Dataset ID
71410cc6-5acb-4a5e-bb68-7597cd1479dd

Overview

Summary of dataset and variables

The Motorway and Trunk Roads are the main transport arteries in Wales and they carry the highest volume of traffic per vehicle kilometre. The Welsh Government is the highway authority for the motorway and the trunk road network, whilst all other public highways are the responsibility of the local authority it’s within. These statistics present information about the length and condition of roads in Wales and are based upon financial year.

Data collection or calculation

Data is collected from local authorities.

Statistical quality

Motorway: Roads identified as M on road signs and which are reserved for use by certain types of traffic only. The A48(M) is included in this group. The data are provided by the Welsh Government's Network Management Division.

A: trunk roads: A trunk roads comprise the national network of strategic routes which cater for the through movement of long distance traffic for which the Welsh Government is the highway authority. The network comprises some of the all-purpose roads (A roads), which are open for use by all classes of traffic, and special roads such as motorways (which are separately identified in the tables). For all other public roads the local authorities are the highway authorities.

A: county roads: also known as Principal classified roads. Roads of regional and urban strategic importance.

B and C roads: also known as Non-principal classified roads. These distribute traffic to urban and rural localities.

Minor surfaced roads: also known as Unclassified. These are local distributor and access roads.

Related reports

Published by

Organisation
Welsh Government
Contact email
stats.transport@gov.wales