LIVEIncidentM4 westbound entry slip at junction J3 — Carriageway closed23:36 (11:36pm)LIVEIncidentM4 westbound between junctions J3 and J4 — Carriageway closed23:31 (11:31pm)LIVERoadworksM4 eastbound between J17 and J16 — Hard shoulder closed23:36 (11:36pm)LIVERoadworksM4 eastbound between J17 and J16 — Hard shoulder closed23:36 (11:36pm)LIVERoadworksM4 eastbound between J18 and J17 — Restriction23:36 (11:36pm)See all the latest news →LIVEIncidentM4 westbound entry slip at junction J3 — Carriageway closed23:36 (11:36pm)LIVEIncidentM4 westbound between junctions J3 and J4 — Carriageway closed23:31 (11:31pm)LIVERoadworksM4 eastbound between J17 and J16 — Hard shoulder closed23:36 (11:36pm)LIVERoadworksM4 eastbound between J17 and J16 — Hard shoulder closed23:36 (11:36pm)LIVERoadworksM4 eastbound between J18 and J17 — Restriction23:36 (11:36pm)See all the latest news →
50M4 EASTBOUND BETWEEN J18 & J171 signalset 05:50 (5:50am)Overhead MessageCONGESTION CAUTIONWestbound, At J4Bset 23:29 (11:29pm)Overhead MessageQUEUE CAUTIONEastbound, 4 signsset 23:29 (11:29pm)Overhead MessageQUEUE AHEADEastbound, At J4Bset 23:24 (11:24pm)Overhead MessageFOGEastbound, 4 signsset 23:20 (11:20pm)Overhead MessageFOG SLOW DOWNEastbound, 6 signsset 23:18 (11:18pm)Overhead MessageFOG SLOW DOWNWestbound, 4 signsset 23:18 (11:18pm)Overhead MessageFOGWestbound, 3 signsset 23:18 (11:18pm)See all the overhead messages →See all the speed limit signs →50M4 EASTBOUND BETWEEN J18 & J171 signalset 05:50 (5:50am)Overhead MessageCONGESTION CAUTIONWestbound, At J4Bset 23:29 (11:29pm)Overhead MessageQUEUE CAUTIONEastbound, 4 signsset 23:29 (11:29pm)Overhead MessageQUEUE AHEADEastbound, At J4Bset 23:24 (11:24pm)Overhead MessageFOGEastbound, 4 signsset 23:20 (11:20pm)Overhead MessageFOG SLOW DOWNEastbound, 6 signsset 23:18 (11:18pm)Overhead MessageFOG SLOW DOWNWestbound, 4 signsset 23:18 (11:18pm)Overhead MessageFOGWestbound, 3 signsset 23:18 (11:18pm)See all the overhead messages →See all the speed limit signs →
Live M4 traffic data from National Highways · updated 23:37 (11:37pm) Sun 8 Nov 2026
M4
Map of M4 Motorway Junctions
Map of the M4 motorway junctions.
Showing live speeds westbound. The map shows one direction at a time; tap the other button to switch. For both directions side by side, with every sign and incident, see the live M4 speed flow map.
60 mph +50–5930–4915–29under 15closedno live reading
This map shows the M4 in England, junctions 1 to 23. The M4 in Wales, junctions 23 to 49, has its own map.
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".
The M4 runs ~189 miles between London and South Wales, crossing the Severn. It meets the M25 (J4b), M32 (J19), M5 (J20), M48 (J21/J23) and M49 (J22). Tap Latest M4 Traffic News and search a junction for live updates.
Also travelling on the M25?
The M4 meets the M25 London orbital motorway at Junction 4b. If your journey also uses the M25, see our sister site M25 Traffic for the latest M25 traffic news and updates in the same easy-to-use format.
M4traffic.co.uk is dedicated to the latest M4 traffic news, checked every five minutes, 24 hours a day. The M4 meets the M25 at Junction 4b near Heathrow and the M5 near Bristol — see M25 Traffic and M5 Traffic.M4traffic.co.uk is dedicated to the latest M4 traffic news, checked every five minutes, 24 hours a day. The M4 meets the M25 at Junction 4b near Heathrow and the M5 near Bristol — see M25 Traffic and M5 Traffic.
