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Data Provider: Welsh Government National Statistics A-road lengths, by road type and local authority
[Collapse]Road type[Filtered]
[Collapse]Road type 1
[Collapse]Road type 2
Road type 3
[Collapse]Type of carriageway[Filter]
Type of carriageway 1
[Collapse]Road Speed[Filter]
Road Speed 1
[Collapse]Local Authority[Filter]
Local Authority 1
[Collapse]TotalClick here to sortTotal
[Expand]Click here to sortMotorway[Collapse]Total (Excluding Motorway)Click here to sortTotal (Excluding Motorway)
[Collapse]A County[Collapse]A Trunk[Expand]Click here to sortB and C roads[Expand]Click here to sortMinor surfaced roads
[Collapse]A County[Collapse]A Trunk
[Collapse]Total all carriagewaysClick here to sortTotal all carriageways[Collapse]Total all carriagewaysClick here to sortTotal all carriageways
[Collapse]Dual carriageway[Collapse]Single carriageway[Collapse]Dual carriageway[Collapse]Single carriageway
[Collapse]All speeds[Collapse]All speeds[Collapse]All speeds[Collapse]All speeds
Click here to sortBuilt-upClick here to sortNon built-upClick here to sortBuilt-upClick here to sortNon built-upClick here to sortBuilt-upClick here to sortNon built-upClick here to sortBuilt-upClick here to sortNon built-up
WalesIsle of Anglesey0.,224.31,224.3
Neath Port Talbot18.67.49.858.941.9118.00.324.
Vale of Glamorgan3.,034.91,038.5
Rhondda Cynon Taf9.,318.71,328.4
Merthyr Tydfil0.
Blaenau Gwent0.


Road Lengths in Wales

Last update
July 2019 July 2019

Next update
July 2020

Publishing organisation
Welsh Government

Source 1
Road lengths data collection, Welsh Government

National Statistics

Lowest level of geographical disaggregation
Local authorities

Geographical coverage
Local authorities

Languages covered
English and Welsh

Data licensing
You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see

General description
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 reference periods
1995-96 to 2018-19

Revisions information
There were no real changes to motorway lengths in 2018-19 but the estimate changed slightly because of improved methodology. The majority of local authorities have only had minor changes to the motorway lengths (plus or minus a maximum of 0.2 km) resulting in a combined increase of 0.3 km overall.
The two exceptions are the increases in Monmouthshire and Newport (0.8 km and 0.7 km respectively). These are due to the inclusion of sections of road previously interpreted as slip road; where the M48 joins the M4 in Monmouthshire and where the A48(M) joins the M4 in Newport. These joining lengths are regarded as motorway not slip road because vehicles do not exit one road to join the other, they simply merge together.

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.

Road Length M4