M4 Junction 2: Brentford (A4, A205, A315)
Junction 2 at Brentford links the M4 to the A4 and the A205 South Circular, with Kew Bridge close by. Kew Palace and the edge of Kew Gardens are under a mile south, and Syon House about a mile south-west. Boston Manor is about a mile west.
Delivery drivers on their rounds of Brentford's offices, visitors heading for Kew, and people coming home to Brentford all use this junction. The map, the junctions either side and our own records are all on this page.
Check this junction now: live M4 speed flow map · latest M4 traffic news · M4 serious incidents · M4 accidents
M4 Junction 2 Now: Accidents, Incidents and Roadworks
Live traffic news at M4 Junction 2
This is the news for Junction 2 only, not the whole M4. For the rest of the motorway see all the latest M4 traffic news, the overhead signs and the speed limits in force now.
Updated 21:22 (9:22pm) Wed 21 Oct 2026
Live Traffic Speeds at M4 Junction 2
The speed strip below shows the M4 around this junction, both directions, from National Highways’ live data, checked every five minutes.
Untick all three to see just the speeds. We show the important overhead signs and the mandatory speed limits (red ring); see every overhead sign.
Go to our live M4 traffic speed flow map ›
NOTE: The speed flow, overhead sign messages or other information shown on our live traffic speed flow map is updated every few minutes. We cross check the data and aim to provide warnings if there could be a delay or an inaccurate speed reading. There can be occasions, beyond our control, and despite our best efforts where the speed flow could be inaccurate. We cannot therefore guarantee the speed you can expect on any stretch of the motorway is always accurately shown. However we hope you will find our live traffic speed flow map a useful tool in trying to plan your journey. Safe driving.
All the latest M4 traffic news →Live M4 traffic speed flow map →
M4 J2 in Our Records
We recorded two incidents at J2 in the last 13 days: both breakdowns or obstructions. Westbound, the slowest daytime hour is 18:00, about 5 mph below the typical speed. Eastbound, traffic usually keeps close to its typical speed through the day; the slowest hour is 08:00.
Average speed by hour of day at J2
Westbound
Eastbound
Incidents per week at J2
The latest 2 here
- Thu 15 Oct, 19:56 (7:56pm) Broken Down Vehicle ✓Reported by National Highways
M4 westbound between junctions J2 and J3
✓ Cleared after about 19 minutes - Wed 14 Oct, 17:36 (5:36pm) Brakes ✓Reported by National Highways
M4 westbound between junctions J2 and J3
✓ Cleared after about 21 minutes
Built from our own records of National Highways’ live data for the M4 either side of J2: speeds from 13 days of five-minute readings, incidents from the last 13 days (we started recording incidents on 09/10/2026). Each incident is counted once. Updated every five minutes.
- Junction M4 J2, Brentford
- Roads at this junction A4, A205, A315
- Nearest town Brentford, 1.1 miles west
- Junction before J1, Chiswick Roundabout, about 0.8 miles in a straight line
- Junction after J3, Cranford Parkway, about 4.9 miles in a straight line
Around M4 Junction 2: Brentford: Towns and Places on the Map
| Place | What it is | From the junction |
|---|---|---|
| Kew Palace | Attraction | Under a mile south |
| Gunnersbury Park Museum | Attraction | Under a mile north-east |
| Boston Manor | Attraction | About 1 mile west |
| Syon House | Historic house or castle | About 1 mile south-west |
| Pagoda | Attraction | About 1.5 miles south |
| Chiswick House | Attraction | About 1.5 miles east |
| Hammersmith bridge | Attraction | About 3 miles east |
| World Rugby Museum | Attraction | About 3 miles south-west |
