A collapsed manhole is causing disruption for motorists travelling on the A30, near Heathrow Airport.
One lane has been closed on the A30 Great South-West Road eastbound at the junction of Sheffield Road, just after Terminal 4.
While workmen deal with the collapsed manhole, one of the two lanes will remain open. But the closure of one lane has caused tailbacks in the area.
The incident, in Hounslow, has been affecting people travelling in the area since around 9am on Tuesday.
Motorists are advised to seek an alternative route if possible to avoid further congestion.