Request ID: FOI-0463-2122 Date published: 15 June 2021
You asked
I would like to request information about tube journeys that involve out of station interchanges (OSIs).
a) What was the most commonly used OSI (in either direction) in 2020?
b) What was the least commonly used OSI (in either direction) in 2020?
If possible, could you provide estimates for the number of people using such OSIs as you did in response to the same question posed for data in 2019 (https://www.whatdotheyknow.com/request/tube_journeys_using_osis#incoming-1500952)
We answered
TfL Ref: FOI-0463-2122
Thank you for your request received by Transport for London (TfL) on 5 June 2021.
Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy. I can confirm that we hold some of the information you require. You asked:
I would like to request information about tube journeys that involve out of station interchanges (OSIs).
a) What was the most commonly used OSI (in either direction) in 2020? b) What was the least commonly used OSI (in either direction) in 2020?
If possible, could you provide estimates for the number of people using such OSIs as you did in response to the same question posed for data in 2019.
Please note we don’t have data for the whole of 2020. We do not hold detailed information on out-of-station interchanges (OSIs) beyond the last 8 weeks due to data retention rules. Therefore, we are only able to provide information on the most and least commonly used OSIs over the period 18th April - 13th June 2021 as follows:
The most commonly used OSI was London Bridge LU; 695,381 journeys involved using this OSI. The least commonly used OSI was Sudbury Hill Hrw; 10 journeys involved using this OSI.
Please note the response to the previous request which you referenced covered only an 8 week period between 8th Nov 2019 to 8th Jan 2020. Unfortunately this detail was not made clear in the response.
If you are considering submitting a further request please think carefully about whether the request is essential at this current time, as answering FOI/EIR requests will require the use of limited resources and the attention of staff who could be supporting other essential activity. Where requests are made, please note that our response time may be impacted by the current situation.
If this is not the information you are looking for, or if you are unable to access it for any reason, please do not hesitate to contact me.
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Yours sincerely
Eva Hextall FOI Case Management Team General Counsel Transport for London
