Bus queue at Oxford Circus
The Tube strike is causing disruption across the Underground network and services are not expected to return to normal until Thursday morning.
Reduced services and partial suspensions are in place across the Tube network. The Circle Line is completely suspended.
Good services are running on the DLR and London Overground.
About 70 stations are closed which is causing disruptions on all lines so check with staff before getting on your train to ensure you can get out the other end.
A case in point is Odile's experience. She emailed BBC London to say:
"Got up nice and early - 5am to catch Tube into White City - allowing extra 30 mins to walk at the other end. Checked tfl.gov.uk, all OK. However, when I got to Northolt at 6.30 am the station was closed and a train passed by on the line going towards White City but no one could get on it because station was closed."
Transport for London
website for live travel information and for a full list of station closures.
BBC London's Transport Correspondent Tom Edwards
reports that London Underground are saying they are operating a better service (about 40% of a normal service) than the previous two strikes.
However, Tom also reports that the unions are insisting the walkout is 'rock solid' and that over 11,000 of its members are taking part in the strike.
You've gotta laugh
The Telegraph website is finding humour in disruptions on the Tube network by publishing
"the web's best jokes"
How we used to live
British Pathe has this
on its website showing how Londoners got around during a Tube strike in 1962.
As with the first two strikes, we are trialling our
interactive Tube strike map.
You can click on various locations on the map (Tube stations, railway stations etc) to see updates from our travel news team and BBC reporters who are out and about.
You can also contribute to the map yourself, if you know of a station closure or other useful location-based information that you can share with your fellow Londoners.
Background to the dispute
This 24-hour strike is part of an industrial dispute between Tube workers and transport bosses over job cuts.
Earlier this week, BBC London invited Bob Crow of the RMT and Mike Brown of London Underground to write letters to the London public outlining their respective positions.
Read what they had to say here:
BBC London's Transport Correspondent Tom Edwards and our travel presenter Steve Phillips have filmed a special
video blog discussing the Tube strike.