Bus drivers at Abellio garages are planning to strike for ten days in November and December, with the first on Tuesday, November 22, and the last day of action on Saturday, December 17.
This is expected to affect 60 routes, mainly in west and south London.
Transport for London (TfL) is advising customers in the affected areas to “check before they travel” and leave more time for their journeys.
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Bus routes operated by Abellio will be affected for periods of between one to three days in the coming weeks, totalling 10 days of planned strike action.
Services will be affected from 5am on the first day of each period of strike action, through to around 6am after the final day of a period of strike action.
Night buses will run as normal into the morning of the start of a period of strike action.
A full list of affected routes, which comprises around 10 per cent of the bus network, is available on TfL's webpage.
A normal service is expected on London's 483 other bus routes.
TfL wants to ensure that many bus services are operating in west and south London, however, they will likely be busier than normal.
To ensure these services run as smoothly, TfL advises customers to have their cards ready to avoid delays and to make space for wheelchair users.
Louise Cheeseman, Director of Buses at TfL, said: "We apologise for any disruption caused to Londoners. There still will be options for people to travel in west and south London, but other routes may be busier than normal.
“We're encouraging everyone in these areas to plan ahead, check before they travel and leave more time for their journeys.
“Our free TfL Go app and website are really easy ways to check your travel.”
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