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The M4 is a UK motorway running from west London to southwest Wales, with a length of 189 miles (304 km). It was built in stages from 1961 to 1996, and has several major junctions, bridges and services along the way.
Check live traffic conditions for the M4 motorway, reporting accidents, roadworks, congested hotspots and traffic jams on the M4.
Find out the latest traffic news, updates and travel information for the M4 motorway, which runs from London to south Wales. Learn about the worst junctions, accident hotspots and upcoming roadworks on the M4.
Map of M4 Motorway Junctions. To the West the M4 at M4 Junction 20 which heads north to Devon Cornwall and the South West of England. The Western end of the M4 is in South Wales Junctions 23 to 48. Bridgend is on Junctions 25 to 37, M4 Junctions 44 and 45 for Swansea, Junctions 30 to 33 for Cardiff and Junctions 24 to 28 for Newport.
The road from Dublin to Sligo is around 200 kilometres long and uses the M4 motorway for the first 60 km, and the N4 for the remainder which varies from a grade separated dual carriageway to a single.
The M4 is a major motorway in Britain, linking London to South Wales and the West Country. It crosses the Severn Estuary on the Second Severn Crossing and has five consecutive motorway-to-motorway interchanges.
Find out the current traffic conditions, incidents, roadworks and delays on the M4 motorway. Search by keywords or browse the latest M4 traffic reports and updates on this website.
