Buses between Oxford and Abingdon are being diverted because of jams resulting from the roadworks affecting the Kennington and Hinksey Hill roundabouts and the Oxford bypass.
Oxford Bus Company is diverting its X3 and X13 bus services via Bagley Wood Road through Kennington as and when there is congestion.
Spokesman Phil Ashworth said: “As soon as traffic starts to build up we are diverting, but we don’t want to unless we absolutely have to.”
Stagecoach Oxford is also diverting its 31 bus along the same route.
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