Map of M4 Motorway Junctions

Map of the M4 motorway junctions.

West M4

To the West the M4 joins the M5 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.

East M4

At the eastern end of the M4 is London, with Junctions for Slough, Reading, Newbury, Swindon and Bristol on the way to Wales in the West.

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M4 westbound within J22 | Westbound | Congestion
Thu, 25 Jun 2026 23:10:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 00:15 and 00:30 on 26 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J22 westbound access | Westbound | Congestion
Thu, 25 Jun 2026 23:04:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 00:00 and 00:15 on 26 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J22 westbound access | Westbound | Congestion
Thu, 25 Jun 2026 21:51:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 22:45 and 23:00 on 25 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J22 westbound access | Westbound | Congestion
Thu, 25 Jun 2026 22:10:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 25 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J22 | Westbound | Congestion
Thu, 25 Jun 2026 22:24:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 25 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News