There's commuter chaos in London this week, with strikes affecting the London Underground and other public transport services.
The walkout is in relation to a row over pay and working conditions, with concerns over "fatigue management" - the stress that early and late shifts are having on the health of its members.
But how long are the strikes going to last? Here's everything you need to know about the industrial action.
The strike datesBetween Monday (8th) and Thursday (11th), there will be little or no service on all of the Tube as different parts of RMT ( Rail, Maritime And Transport union) walk out on different days.
READ MORE: London Underground station mysteriously removed from TfL map without a word
The Tube will open on Friday 12 September at 8am.
There is also a separate dispute on the Docklands Light Railway (DLR) on Tuesday and Thursday, which will mean no DLR on those days either.
The Elizabeth line and the Overground will operate as normal but will be much busier, as will the capital's roads.
Monday September 8 – all fleet (except engineering vehicles operations and maintenance and ERU), plus engineering, stations and trains members walk out. Strike from 12.01am to 11.59pm.
Tuesday September 9 – signallers, service control and ERU members strike between 12.01am and 11.59pm.
Wednesday September 10 – all fleet (except engineering vehicles operations and maintenance and ERU), plus engineering, stations and trains members walk out from 12.01am to 11.59pm.
Thursday September 11 – signallers and service Control members strike between 12.01am and 11.59pm.
Friday September 12 – no strike, but staff and trains need to get back into positions. No services until 8am.
The strike is about both pay and conditions. The RMT union has concerns about "fatigue management" linked to early and late shifts, and has asked for a 32-hour week.
RMT general secretary Eddie Dempsey told the BBC: "Our members are doing a fantastic job to keep our capital moving and work strenuous shift patterns to make sure Londoners get to their destinations around the clock.
"They are not after a king's ransom, but fatigue and extreme shift rotations are serious issues impacting on our members health and wellbeing- all of which have not been adequately addressed for years by London Underground management.
"Coupled with the fact there are outstanding issues around staff travel arrangements, an atmosphere of distrust has been created, where our members feel like no-one is listening to them."
Transport for London (TfL) has said that a 32-hour week is "neither practical and affordable" and would cost hundreds of millions of pounds. It has offered the RMT union a 3.4% pay rise.
A TfL spokesperson said: "We are committed to ensuring our colleagues are treated fairly and, as well as offering a 3.4% pay increase in our ongoing pay discussions, we have made progress on a number of commitments we have made previously.
"We welcome further engagement with our unions about fatigue and rostering across London Underground, but a reduction in the contractual 35-hour working week is neither practical nor affordable."
They added: "Given the improvements we have recently put in place in response to concerns raised by our unions, we urge the RMT to put our fair, affordable pay offer to their members and to continue to engage with us rather than threaten strike action, which will only disrupt Londoners."
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