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
Mon, 11 May 2026 22:08:21 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 23:00 and 23:15 on 11 May 2026.

M4 fast slip from M4 J4 westbound exit to M4 spur (Heathrow) southbound | Westbound | Road Works
Mon, 11 May 2026 21:21:32 GMT
M4 Roadworks
Location : The M4 westbound exit slip at junction J4 for Heathrow. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 18 May 2026 to 05:30 on 19 May 2026. Lanes Closed : All lanes will be closed.

M4 eastbound at the Heston services slip road between J3 and J2 | Eastbound | Road Works
Mon, 11 May 2026 21:23:56 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at Heston Services. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 18 May 2026 to 20 May 2026. Lanes Closed : All lanes will be closed.

M4 eastbound at the Heston services slip road between J3 and J2 | Eastbound | Road Works
Mon, 11 May 2026 21:23:57 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at Heston Services. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 18 May 2026 to 20 May 2026. Lanes Closed : All lanes will be closed.

M4 westbound at the Heston services slip road between J2 and J3 | Westbound | Road Works
Mon, 11 May 2026 21:31:23 GMT
M4 Roadworks
Location : The M4 westbound exit slip at Heston Services. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 18 May 2026 to 20 May 2026. Lanes Closed : All lanes will be closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News