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 eastbound within J18 | Eastbound | Congestion
Sat, 09 May 2026 03:00:19 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 04:00 and 04:15 on 9 May 2026.

M4 eastbound within J18 | Eastbound | Congestion
Sat, 09 May 2026 02:41:18 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 03:45 and 04:00 on 9 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J18 eastbound exit | Eastbound | Congestion
Sat, 09 May 2026 00:22:19 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 01:15 and 01:30 on 9 May 2026.

M4 J4 westbound access | Westbound | AuthorityOperation
Sat, 09 May 2026 02:29:04 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J4 . Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 04:45 and 05:00 on 9 May 2026. Return To Normal : Normal traffic conditions are expected between 04:45 and 05:00 on 9 May 2026. Lanes Closed : All lanes are closed.

M4 J18 eastbound exit | Eastbound | Congestion
Sat, 09 May 2026 02:43:16 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 03:45 and 04:00 on 9 May 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