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 J14 westbound exit | Westbound | Congestion
Mon, 27 Apr 2026 05:55:50 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J13 and J14 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:00 and 07:15 on 27 April 2026. Delay : There are currently delays of 30 minutes against expected traffic.

M4 J14 westbound exit | Westbound | Congestion
Mon, 27 Apr 2026 05:11:17 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J14 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 06:15 and 06:30 on 27 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J16 westbound exit | Westbound | Congestion
Sun, 26 Apr 2026 19:21:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J16 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 20:15 and 20:30 on 26 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J17 westbound exit | Westbound | Congestion
Mon, 27 Apr 2026 03:17:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J17 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 04:15 and 04:30 on 27 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J11 and J12 | Westbound | Broken down vehicle
Mon, 27 Apr 2026 04:55:02 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J11 and J12 . 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 06:30 and 06:45 on 27 April 2026. Return To Normal : Normal traffic conditions are expected between 06:30 and 06:45 on 27 April 2026. Lanes Closed : There is one of four lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News