OXFORD Bus Company has said there are delays of up to an hour across the city tonight.
The firm tweeted to say roadworks and rush hour traffic had led to the disruption.
An earlier three-vehicle crash in Abingdon Road also had a knock-on effect.
Thames Valley Police said there was disruption to peak time traffic at about 5.15pm while a lane was closed.
The collision involved a silver Toyota Prius, a grey Peugeot 207 and a Volkswagen Scirocco, police spokeswoman Lucy Billen said.
An ambulance was called and one person was assessed at the scene but not taken to hospital.
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