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 J16 eastbound exit | Eastbound | Congestion
Sun, 15 Mar 2026 10:44:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J16 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:45 and 11:00 on 15 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Sun, 15 Mar 2026 08:24:18 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 08:15 and 08:30 on 15 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J6 westbound exit | Westbound | Congestion
Sat, 14 Mar 2026 12:08:28 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J6 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:45 and 12:00 on 14 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J19 eastbound exit | Eastbound | Broken down vehicle
Sat, 14 Mar 2026 14:02:38 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J19 . Lane Closures : Lane two is closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 14:45 and 15:00 on 14 March 2026. Return To Normal : Normal traffic conditions are expected between 14:45 and 15:00 on 14 March 2026. Lanes Closed : There is one of two lanes closed.

M4 westbound between J2 and J3 | Westbound | Congestion
Sat, 14 Mar 2026 16:41:34 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J2 and J3 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:45 and 17:00 on 14 March 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