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 J12 westbound exit | Westbound | Broken down vehicle
Fri, 19 Jun 2026 06:51:29 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J12 . Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 08:30 and 08:45 on 19 June 2026. Lanes Closed : There are lane closures.

M4 westbound within J19 | Westbound | Congestion
Fri, 19 Jun 2026 01:53:16 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 02:45 and 03:00 on 19 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J19 | Westbound | Congestion
Thu, 18 Jun 2026 22:22:23 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 23:15 and 23:30 on 18 June 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J19 | Westbound | Congestion
Thu, 18 Jun 2026 23:15:26 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 00:15 and 00:30 on 19 June 2026.

M4 J19 westbound access | Westbound | Congestion
Fri, 19 Jun 2026 00:40:16 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 01:45 and 02:00 on 19 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