January Tube strike guide: What you need to know
Members of the RMT and Transport Salaried Staffs' Association (TSSA) unions are taking industrial action in protest at plans to close ticket offices on the London Underground.
The 24-hour strike will continue until 18:00 GMT on Monday.
Tube bosses have warned commuters the majority of underground stations in Central London will be closed, and a normal service is not expected to resume until Tuesday morning.
Which lines are running?
Transport for London (TfL) says the number of Tube stations closed are subject to change. At 11:00 GMT, 114 stations were closed. Check if your Tube station is closed here.
This is the current status on the various Tube lines:
The Docklands Light Railway (DLR), London Overground and Tram are all running with a good service but TfL have warned that services will be busier.
National Rail services are not directly affected but there is no Underground services from stations such as Victoria, King's Cross, Waterloo, Paddington, Euston, Bank and London Bridge.
Tube bosses previously warned that while the strike officially ends at 18:00, some stations may close by 19:00 on Monday.
How should I travel?
Buses, roads and rail services including the DLR are all expected to be much busier than usual.
TfL has laid on over 100 extra buses and "enhanced" river services to help customers get around the city. Travel Ambassadors are on hand to advise on alternative routes, but your best bet might be to walk or cycle if you are able.
Here is a walking map of central London showing the walking time, in minutes, between stops.
Don't get caught out on the roads
If you are planning to drive, be aware of these major road works that may affect your journey:
LONDON BRIDGE: Tooley Street eastbound is closed for major long-term upgrades at London Bridge Station from the A3 Borough High Street/Duke Street Hill to Bermondsey Street
FARRINGDON: There are narrow lanes because of major Crossrail works on the A201 Farringdon Road between Cowcross Street (Farringdon Station) and Charterhouse Street
MILLBANK: There are narrow lanes and one lane is closed because of junction improvements on the A3212 Millbank at Horseferry Road (Lambeth Bridge)
CANNON STREET: Westbound is closed for carriageway repairs between King William Street and Queen Victoria Street (Mansion House)
BLOOMSBURY: Great Russell Street Westbound is closed for gas mains work between Museum Street and the A400 Bloomsbury Street. It is only one-way (eastbound) from Bloomsbury Street towards the British Museum
HOLLOWAY: The A1 Holloway Road is closed in both directions because of major roadworks between Fairbridge Road (Upper Holloway Station) and Marlborough Road
Roads on the edge of the congestion charge zone are also expected to be busier than normal.