Rail users and motorists are facing a slog to get into work on Tuesday (September 12) morning.
A collision on the M25 near Heathrow is causing delays and congestion, while a signalling problem at Paddington Station is hitting rail commuters.
However, a good service is running on all London Underground lines, according to Transport for London (TfL) .
The incident on the M25 saw a car spin and stop on the hard shoulder and lane one of the anti-clockwise carriageway just before Junction 15 with the M4, leading to congestion up to junction 17 A412 at Maple Cross.
All lanes had reopened by 6.50am, but there is still delays due to the incident.
Over on the trains, some services running between Paddington Station and Slough have been cancelled because of signalling problems.
The route runs through west London, calling a stations including Iver, Hayes and Harlington, Southall and Ealing Broadway.
Train operators Great Western Railway (GWR) say there will be a reduction in trains travelling in both directions, and warns that other cancellations or alterations may occur.
Heathrow Connect services are also suspended, GWR say.
As a result of the rail problem, TfL is accepting GWR tickets on the bus and London Underground between Hayes to Heathrow and Ealing to Slough.
The rail disruption is expected to last until 9am at the earliest.
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