Drivers face delays in Abingdon Road, Oxford until Tuesday because of roadworks.
Temporary traffic lights have been installed by the junction with Weirs Lane as work began today to install new pedestrian crossing points.
Oxford Bus Company said on Saturday morning that the lights were leading to delays of up to 30 minutes for its X3, X13, 35 and 300 services.
Stagecoach reported "major delays" and said its 31 service inbound is diverting via Heyford Hill and Iffley Road.
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