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 eastbound between J17 and J16 | Eastbound | Broken down vehicle
Mon, 16 Mar 2026 11:28:05 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J17 and J16 . 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 12:00 and 12:15 on 16 March 2026. Return To Normal : Normal traffic conditions are expected between 12:00 and 12:15 on 16 March 2026. Lanes Closed : There is one of three lanes closed.

M4 eastbound between J20 and J19 | Eastbound | Accident
Mon, 16 Mar 2026 09:19:12 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J20 and J19 . Lane Closures : The hard shoulder is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 10:15 and 10:30 on 16 March 2026. Return To Normal : Normal traffic conditions are expected between 11:00 and 11:15 on 16 March 2026.

M4 eastbound within J20 | Eastbound | Congestion
Mon, 16 Mar 2026 07:08:20 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 07:00 and 07:15 on 16 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J11 eastbound exit | Eastbound | Congestion
Mon, 16 Mar 2026 08:18:13 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J11 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:15 and 08:30 on 16 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J16 and J17 | Westbound | Road Works
Mon, 16 Mar 2026 08:11:13 GMT
M4 Roadworks
Location : The M4 westbound between junctions J16 and J17 . Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 08:00 and 16:00 from 23 March 2026 to 27 March 2026.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News