Passengers travelling to London on coaches are facing delays and changes to routes caused by protesting lorry drivers.
The Oxford Bus Company is using an alternative route into the capital to bypass Westway, in west London, where hundreds of hauliers are converging.
Coaches are diverting via the North Circular, a marginally longer route.
OBC said it was still dropping off at all its stops in central London - but warned this may change if the situation worsens.
A spokesman for the company advised passengers to consult drivers when boarding coaches to get the latest information.
Updates will also be made to its website, oxfordbus.co.uk, throughout the day.
From 10am today, police closed a London-bound section of Westway to allow the lorries to park along the road.
The London-bound carriageway is due to stay shut until 4pm, while police motorcyclists escort groups of about 20 protesting truckers a time on a circular route through central London.
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