Traffic is piling up on the A40 eastbound near the Polish War Memorial after a vehicle fire.
An earlier incident also caused traffic to build on the A40 when a car and motorbike collided at a petrol pump in Perivale.
London Fire Brigade is on the scene at the war memorial and has closed one of the two lanes, slowing down rush hour traffic.
The vehicle is on the A40 at West End Road, but traffic is tailing back for several miles.
Check below for more updates as we get them.
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Time to wrap things up
It looks like traffic is back to normal on the A40, meaning it is time to wrap up our live blog.
Traffic is still slow on the A406 Southbound near Park Royal following a broken down vehicle which has been cleared.
Thanks for joining us.
All lanes reopened
All lanes have now reopened on the A40 at the Polish War Memorial Undespass.
Traffic is returning to normal.
Hanger Lane lorry breakdown causing troubles on the A406
A lorry has broken down on the A406 Southbound at the Hanger Lane Gyratory.
One of four lanes were closed but have just reopened.
Traffic is queuing back to the A404 Brentfield, Harrow Road Underpass.
Traffic at East Acton
The traffic we mentioned earlier, on the A40 at East Acton, may be due to a broken down vehicle.
Reports suggest the car has since been removed.
There are also minor delays on the Jubilee Line caused by a faulty train earlier at North Greenwich.
London Fire Brigade were called to the scene of the car fire at 8.07 by multiple callers.
Two fire engines raced to the scene and finished responding to the fire at around 8.30pm.
There are reports that the engines were positioned on the West End Road roundabout, above the A40, and tackled the car fire from above.
Traffic at Hillingdon
TfL’s traffic cameras have also picked up slow traffic on the A40 at Long Lane, near Hillingdon station.
Traffic is heavy upto the M40 at Denham Roundabout.
Heavy traffic at A40 East Acton
The A40 is at a standstill at Old Oak Road, East Acton, near Hammersmith Hospital.
TfL traffic cameras are showing traffic barely moving.
This TfL traffic camera photo, from 8.51am shows the roundabout above the vehicle fire.
You may be able to make out the long tailbacks in the top left hand corner of the picture.
At 7.10am today police were called to a collision at a petrol station on the A40 at Perivale.
A car had collided with a motorbike.
Emergency services remained on the scene for some time and although no lanes were closed, traffic was slow through to the Hanger Lane Gyratory.
What we know so far
A vehicle is on fire on the A40 under the West End Road roundabout, near RAF Northolt.
One lane has been closed as emergency services are on the scene.