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 J13 and J12 | Eastbound | Congestion
Sat, 02 May 2026 18:08:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J13 and J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:00 and 19:15 on 2 May 2026. Delay : There are currently delays of 40 minutes against expected traffic.

M4 eastbound within J13 | Eastbound | Congestion
Sat, 02 May 2026 18:07:20 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound at junction J13 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 19:00 and 19:15 on 2 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J13 and J12 | Eastbound | Accident
Sat, 02 May 2026 16:38:07 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J13 and J12 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 18:45 and 19:00 on 2 May 2026. Return To Normal : Normal traffic conditions are expected between 18:45 and 19:00 on 2 May 2026. Delay : There are currently delays of 20 minutes against expected traffic. Lanes Closed : There are lane closures.

M4 eastbound between J13 and J12 | Eastbound | Congestion
Sat, 02 May 2026 17:11:02 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J13 and J12 . Reason : Congestion. Status : Currently Active. Cause : Road traffic collision. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J2 | Westbound | Congestion
Sat, 02 May 2026 17:32:24 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 18:30 and 18:45 on 2 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