Tube station Hangar Line is horrible - its inside the roundabout and a slightly un-nerving walk to the industrial estate nearby .
I used to come through central London ( from Islington) heading out on the A40. At 07.00 the queue on the A40 into London started at Perivale / sometimes Greenford. Listen out on traffic news for "accident at Polish war memorial "......its quite regular. The queue on any road leading to the Hangar Lane Gyratory ( survival of the fittest , death defying driving ) was always long and could take 20 minutes just to get around the darn thing.
From any side and from any time unless it was say 20.00 at night, always traffic.
Lots of sneaky cameras on the A40 so look out for sudden braking as someone spots the camera hidden behind a road sign etc. In addition there is always someone in the outside lane who cuts across 2 lanes of traffic to force their way on to the exit ramp for the gyratory system. Lots of regular accidents there too.
If you can travel in off hours - as someone else said , arrive for 10.00 leave at 19.00 , then you might be Ok . Just dont believe the "mileage vs. average time to do that journey " from any trip calculator.
I used to come through central London ( from Islington) heading out on the A40. At 07.00 the queue on the A40 into London started at Perivale / sometimes Greenford. Listen out on traffic news for "accident at Polish war memorial "......its quite regular. The queue on any road leading to the Hangar Lane Gyratory ( survival of the fittest , death defying driving ) was always long and could take 20 minutes just to get around the darn thing.

Lots of sneaky cameras on the A40 so look out for sudden braking as someone spots the camera hidden behind a road sign etc. In addition there is always someone in the outside lane who cuts across 2 lanes of traffic to force their way on to the exit ramp for the gyratory system. Lots of regular accidents there too.
If you can travel in off hours - as someone else said , arrive for 10.00 leave at 19.00 , then you might be Ok . Just dont believe the "mileage vs. average time to do that journey " from any trip calculator.

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