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 J8 eastbound access | Eastbound | Broken down vehicle
Sat, 06 Jun 2026 16:38:17 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J8 . Lane Closures : Lane one is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 18:15 and 18:30 on 6 June 2026. Return To Normal : Normal traffic conditions are expected between 18:15 and 18:30 on 6 June 2026. Lanes Closed : There is one of two lanes closed.

M4 westbound between J8 and J10 | Westbound | Broken down vehicle
Sat, 06 Jun 2026 14:55:09 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and 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 16:30 and 16:45 on 6 June 2026. Lanes Closed : There is one of four lanes closed.

M4 eastbound within J20 | Eastbound | Congestion
Sat, 06 Jun 2026 12:10:26 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:15 and 13:30 on 6 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from M5 J16 northbound to M4 J20 eastbound | Eastbound | Congestion
Sat, 06 Jun 2026 12:27:21 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J20 from M5 north. Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:30 and 13:45 on 6 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

link road from M5 J16 northbound to M4 J20 eastbound | Eastbound | Congestion
Sat, 06 Jun 2026 12:37:52 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound entry slip at junction J20 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 13:30 and 13:45 on 6 June 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