Buses were diverted and drivers were warned to approach with care as traffic lights in Harlington High Street were not working on Wednesday (March 22) morning.
Transport for London (TfL) first announced the issues on Twitter at around 8.30am after the signals were reported out of order.
Drivers have been warned over the outage at the junction on the A4 Bath Road junction with High Street, near Heathrow Airport.
The 90, 140, 285, 423 and H98 route buses have been diverted at High Street.
TfL said: "The traffic signals on A4 Bath Rd j/w High Street Harlington are all out of order. Approach with care."
The lights were fully operational by around 10am.
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