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.

How Do I Find M4 Traffic News?

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M4 J6 westbound exit | Westbound | Congestion
Sat, 14 Mar 2026 12:08:28 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:45 and 12:00 on 14 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound within J10 after A329(M) westbound access | Eastbound | Congestion
Sat, 14 Mar 2026 10:53:26 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J10 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:45 and 11:00 on 14 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J6 westbound exit | Westbound | Congestion
Sat, 14 Mar 2026 05:44:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 05:45 and 06:00 on 14 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J12 | Westbound | Accident
Sat, 14 Mar 2026 06:47:37 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J12 . Lane Closures : Lane three is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 07:45 and 08:00 on 14 March 2026. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 14 March 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J10 and J8 | Eastbound | Vehicle Fire
Sat, 14 Mar 2026 10:34:32 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 11:15 and 11:30 on 14 March 2026. Return To Normal : Normal traffic conditions are expected between 11:15 and 11:30 on 14 March 2026. Lanes Closed : There are two of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News