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 fast slip from M4 J4 westbound exit to M4 spur (Heathrow) southbound | Westbound | Congestion
Mon, 18 May 2026 08:25:25 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J4 for Heathrow. Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 09:30 and 09:45 on 18 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J13 eastbound exit | Eastbound | Congestion
Mon, 18 May 2026 07:51:42 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J13 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:45 and 09:00 on 18 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 eastbound between J2 and J1 | Eastbound | Congestion
Mon, 18 May 2026 07:15:31 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J2 and J1 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:15 and 08:30 on 18 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J19 westbound exit | Westbound | Congestion
Mon, 18 May 2026 07:36:26 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J19 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:30 and 08:45 on 18 May 2026. Delay : There are currently delays of 10 minutes against expected traffic.

M4 J4 eastbound exit | Eastbound | Congestion
Mon, 18 May 2026 07:38:21 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 08:30 and 08:45 on 18 May 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