• How many KM of road networks is TfL responsible for? How many KM of road network are there in London? • How many intersections are in this road network? • Is there a “price” for one KSI that you use for internal calculations? • What kind of TfL personal is involved if an accident happens? Does this differ for the types of accidents? • To you have an internal classification of the type of accidents (according to impact)?

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TfL Ref: FOI-2685-1920

Thank you for your request received by Transport for London (TfL) on 30^th November 2019 asking for information about the TfL road network.

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 the information you require. Yourt questions are answered in turn below:

Question 1: How many KM of road networks is TfL responsible for? How many KM of road network are there in London?

There are 14,790 kilometres of road in London. The Transport for London Road Network (TLRN - or “red route” network) accounts for 590 kilometres (around 5% of the total road network in London, but carrying about 30% of the city’s traffic).

Question 2: How many intersections are in this road network?

TfL does not hold data for the entirety of London. However, there are approximately 7,000 intersections on the ‘Network of Interest’ (defined as all ‘M’ and ‘A’ roads, plus the busiest minor roads – accounting for about 6000 kilometers of the overall network in London).

Question 3: Is there a “price” for one KSI that you use for internal calculations?

The most recent Department for Transport (DfT) measures of values of prevention - in 2018 values - are available online via the following link:

https://www.gov.uk/government/statistical-data-sets/ras60-average-value-of-preventing-road-accidents#history

In accordance with section 21 of the FOI Act, we are not obliged to supply you with a copy of the requested information as it is already accessible to you elsewhere.

Question 4: What kind of TfL personal is involved if an accident happens? Does this differ for the types of accidents?

For all fatalities that take place on TLRN, or within 50m of traffic signals, TfL will organise a site visit. This will include staff from our Network Sponsorship, Engineering, Safety, Compliance Policing and On-street Services and Network Management teams. If there is a fatality or serious incident involving a bus an investigation will take place involving the bus operator, the TfL Safety, Health and Environment team and other professional offices who may be involved as required.

Question 5: To you have an internal classification of the type of accidents (according to impact)?

The DfT STATS20 instructions define road traffic injury severity classifications. The classification of injury severity is published in the DfT ‘Reported Road Casualties Annual Report’, table 2, page 34, here:

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/834585/reported-road-casualties-annual-report-2018.pdf

In accordance with section 21 of the FOI Act, we are not obliged to supply you with a copy of the requested information as it is already accessible to you elsewhere.

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,

David Wells

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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