A simultaneous strike on both the London Underground and the London Overground will go ahead later this month.
Members of the RMT Union will take part in a 24-hour strike on Friday 19 August. Up to 10,000 tube workers will be involved, with 400 Arriva Rail London staff (who work on the London Overground) taking part.
We don't know the full extent of the disruption yet, but it'll likely be the scenario we've all become familiar with in recent months; complete disruption on the day, spilling over into the following day (Saturday 20 August).
Keep an eye on the TfL website closer to the time for updates, though the best advice is to avoid making plans that require public transport on these days.
Tube workers are striking over a dispute over pensions, while Overground workers employed by Arriva Rail London will strike over pay, according to the RMT Union.