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".

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Tue, 14 Apr 2026 07:03:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:00 and 08:15 on 14 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J8 eastbound exit | Eastbound | Congestion
Tue, 14 Apr 2026 06:42:32 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J8 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 14 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound within J20 | Eastbound | Congestion
Tue, 14 Apr 2026 06:17:30 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 07:15 and 07:30 on 14 April 2026. Delay : There are currently delays of 10 minutes against expected traffic.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Tue, 14 Apr 2026 06:20:24 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:15 and 07:30 on 14 April 2026.

M4 eastbound between J22 and J21 | Eastbound | Congestion
Tue, 14 Apr 2026 06:41:28 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J22 and J21 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 14 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