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?

Simply type the search words in the search facility towards the top right of this page and click "search".

M4 westbound between J16 and J17 | Westbound | Accident
Mon, 27 Apr 2026 18:23:06 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J16 and J17 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Accident involving a vehicle that has left the carriageway. Status : Currently Active. Time To Clear : The event is expected to clear between 20:45 and 21:00 on 27 April 2026. Return To Normal : Normal traffic conditions are expected between 20:45 and 21:00 on 27 April 2026. Lanes Closed : There is one of three lanes closed.

M4 J4 eastbound exit | Eastbound | Broken down vehicle
Mon, 27 Apr 2026 17:38:36 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . 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 19:15 and 19:30 on 27 April 2026. Lanes Closed : There is one of three lanes closed.

M4 J19 westbound exit | Westbound | Congestion
Mon, 27 Apr 2026 16:15:31 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 17:15 and 17:30 on 27 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J17 eastbound exit | Eastbound | Congestion
Mon, 27 Apr 2026 16:57:35 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J18 and J17 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 18:00 and 18:15 on 27 April 2026. Delay : There are currently delays of 1 hour against expected traffic.

M4 J8 westbound exit | Westbound | Congestion
Mon, 27 Apr 2026 16:58:36 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J8 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 18:00 and 18:15 on 27 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