Some bus routes have been disrupted in South Oxfordshire causing diversions and delays.
Delays of 15 minutes are expected due to the diversions and increased congestion.
It is not known why the routes have been disrupted.
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In a statement on X (formerly Twitter), Thames Travel said: "Due to disruption on our X32 and ST1 routes, all services will divert via Drayton in the direction of Harwell Campus, the only stop affected will be the Milton Heights Stop for the ST1 service.
"We are expecting delays of 15 minutes due to the diversion and increased congestion."
Thames Travel is based in Didcot.
They employ about 120 staff and maintain a fleet of 70 buses and are part of GoAhead Group and Oxford Bus Company.
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