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 westbound between J16 and J17 | Westbound | Accident
Sun, 22 Feb 2026 16:34:20 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J16 and J17 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Accident involving a vehicle that has left the carriageway. Status : Currently Active. Time To Clear : The event is expected to clear between 18:00 and 18:15 on 22 February 2026. Return To Normal : Normal traffic conditions are expected between 18:45 and 19:00 on 22 February 2026. Delay : There are currently delays of 40 minutes against expected traffic. Lanes Clo...

M4 westbound between J16 and J17 | Westbound | Congestion
Sun, 22 Feb 2026 15:58:28 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J16 and J17 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 16:00 and 16:15 on 22 February 2026. Delay : There are currently delays of 30 minutes against expected traffic.

M4 westbound between J8 and J10 | Westbound | Accident
Sun, 22 Feb 2026 09:05:59 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 10:00 and 10:15 on 22 February 2026. Return To Normal : Normal traffic conditions are expected between 10:00 and 10:15 on 22 February 2026. Lanes Closed : There is one of four lanes closed.

M4 westbound within J22 | Westbound | Congestion
Sun, 22 Feb 2026 12:28:27 GMT
M4 Current Traffic Incidents
Location : The M4 westbound at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 12:30 and 12:45 on 22 February 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J22 westbound access | Westbound | Congestion
Sun, 22 Feb 2026 15:19:21 GMT
M4 Current Traffic Incidents
Location : The M4 westbound entry slip at junction J22 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 15:15 and 15:30 on 22 February 2026.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News