All lanes have reopened at the Hanger Lane roundabout as repair work on a burst water main has been completed.
Motorists have still been warned to expect severe delays this morning (Wednesday March 23) on the approach to Hanger Lane.
There are tailbacks on the A406 to Staples Corner and northbound delays from Uxbridge Road.
Two lanes next to the gyratory were due to be closed until Monday April 3 as work was carried out on a burst water main.
However Transport for London reported the work had been completed on Wednesday March 29.
The work affected traffic on the approach to the roundabout on the A406 and on the A40.
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