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 J3 and J2 | Eastbound | Congestion
Sat, 21 Mar 2026 11:39:22 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J3 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:45 and 12:00 on 21 March 2026. Delay : There are currently delays of 15 minutes against expected traffic.

M4 westbound within J19 | Westbound | Congestion
Sat, 21 Mar 2026 10:11:23 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 10:15 and 10:30 on 21 March 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound between J8 and J10 | Westbound | AuthorityOperation
Sat, 21 Mar 2026 02:26:33 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Police incident. Status : Currently Active. Time To Clear : The event is expected to clear between 03:45 and 04:00 on 21 March 2026. Return To Normal : Normal traffic conditions are expected between 03:45 and 04:00 on 21 March 2026. Lanes Closed : There are two of four lanes closed.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Sat, 21 Mar 2026 09:50:24 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 09:45 and 10:00 on 21 March 2026.

M4 J19 westbound access | Westbound | Congestion
Sat, 21 Mar 2026 10:12:21 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 10:15 and 10:30 on 21 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