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The M4, originally the London-South Wales Motorway, is a motorway in the United Kingdom running from west London to southwest Wales. The English section to the Severn Bridge was constructed between 1961 and 1971; the Welsh element was largely complete by 1980, though a non-motorway section around Briton Ferry bridge remained until 1993.
Check live traffic conditions for the M4 motorway, reporting accidents, roadworks, congested hotspots and traffic jams on the M4.
M4 Traffic News. The M4 is a motorway that runs from London, all the way to south Wales, stretching across the west of the UK. It opened in 1961, and was completed in 1996. The M4 carries over 130,000 vehicles every day, according to data from Highways England.
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.
- Today’S M4 Travel Disruptions
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- M4 Motorway Map
If you are planning to travel on the M4 motorway, you need to stay updated with the latest traffic news and information.
Traffic delays for the M4 motorway in Southern England. Latest travel news from UK Traffic Delays official open source data.
Live traffic flow information. Avoid M4 travel congestion and plan a smarter route. Traffic delay information supplied by UK Traffic Delays. Live traffic reports, roadworks and travel news for the M4 motorway in England. Our M4 travel news is as up to date as possible but please do always check with local radio news sources and always allow plenty ...
M4 Traffic is dedicated to featuring the latest M4 traffic news, traffic updates, traffic reports, details of roadworks and other M4 news of interest to motorists using the M4 motorway. Information about the M4 Motorway.
The M4 is, effectively, the Great Western motorway, doing exactly that job but for the modern era. From suburban London it follows the Thames Valley past Slough, Maidenhead and Reading - home, today, of Britain's technology companies, and a place that has earned the M4 the nickname the "silicon highway".
