FOI request detail

How many road casualties will be saved through reducing the speed limit to 20

Request ID: FOI-1162-1920
Date published: 12 August 2019

You asked

Could you please tell me how many deaths and casualties there have been on the roads you propose to reduce from 30mph to 20mph? (For 2017, 2018 and 2019 to date). Could you also please tell me how many road casualties and deaths there have been in Greater London in 2017,2018 and 2019?

We answered

Our ref: FOI-1162-1920/GH

Thank you for your request received by Transport for London (TfL) on 22 July 2019 asking for information about road casualties.

Your request has been considered under the requirements of the Freedom of Information Act 2000 and our information access policy. I can confirm that we do hold some of the information you require.

The London collision map, available on our website, allows the roads to be entered and collision data to be observed for each year:

Information for 2017 and 2018 is available, but 2019 data has not yet been collated and finalised.

Collision data factsheets for 2018 and previous years are also available here: , along with raw data extracts going back to 2005.

The list of roads is included on our 20mph consultation website:

A summary of the severity of injuries for 2017 and 2018 is shown below:


No. of Casualties

Casualty Severity

1 Fatal

2 Serious

3 Slight













If this is not the information you are looking for, or if you are unable to access it for some reason, please do not hesitate to contact me.

If you are not satisfied with this response please see the attached information sheet for details of your right to appeal.

Yours sincerely

Graham Hurt

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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