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 J18 eastbound exit | Eastbound | Congestion
Fri, 17 Apr 2026 15:30:50 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:30 and 16:45 on 17 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J19 westbound exit | Westbound | Congestion
Fri, 17 Apr 2026 15:29:15 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:30 and 16:45 on 17 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J10 after A329(M) eastbound access | Westbound | Broken down vehicle
Fri, 17 Apr 2026 14:38:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 16:15 and 16:30 on 17 April 2026. Lanes Closed : There is one of three lanes closed.

M4 westbound between J1 and J2 | Westbound | Congestion
Fri, 17 Apr 2026 15:07:07 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J1 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:00 and 16:15 on 17 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J18 westbound exit | Westbound | Congestion
Fri, 17 Apr 2026 15:29:16 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:30 and 16:45 on 17 April 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