Dear Mr Cox

TfL Ref: FOI-0463-2122

Thank you for your request received by Transport for London (TfL) on 5
June 2021.

We will aim to issue a response by 2 July 2021 in accordance with the
Freedom of Information Act 2000 and our information access policy.

However, please think carefully about whether the request is essential at
this current time, as answering FOI 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 and so you may wish to
reconsider the timing of this request. Please notify us as soon as
possible if you would like to withdraw your request at the current time.

We publish a substantial range of information on our website on subjects
including operational performance, contracts, expenditure, journey data,
governance and our financial performance. This includes data which is
frequently asked for in FOI requests or other public queries. Please check
[1]http://www.tfl.gov.uk/corporate/transpar... to see if this helps you.

We will publish anonymised versions of requests and responses on the
[2]www.tfl.gov.uk website. We will not publish your name and we will send
a copy of the response to you before it is published on our website.

In the meantime, if you would like to discuss this matter further, please
do not hesitate to contact me.

Yours sincerely

Eva Hextall

FOI Case Management Team

General Counsel

Transport for London

dangos adrannau a ddyfynnir

Dear Mr Cox

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.

Please see the attached information sheet for details of your right to
appeal as well as information on copyright and what to do if you would
like to re-use any of the information we have disclosed.

Yours sincerely

Eva Hextall

FOI Case Management Team

General Counsel

Transport for London

dangos adrannau a ddyfynnir