FOI request detail

Average Traffic Volume A2 & A501

Request ID: FOI-0485-1718
Date published: 22 June 2017

You asked

Please provide as much detail as possible on the average traffic volumes for the period 2010-2017 on the A501, Marylebone Road, as close as possible to Baker Street Underground Station and the A2, East Rochester Way, as close as possible to Falconwood Rail Station. If possible, it would be useful to know the breakdown of different vehicle types on these roads, i.e. car, lorry, bus, bicycle etc. As finer temporal resolution as is possible would also be helpful, although, I recognise that an annual average may be the best you can provide.

We answered

Our ref: FOI-0485-1718/GH


Thank you for your request received by Transport for London (TfL) on 30 May 2017 asking for traffic counts.


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 the information you require.


Please find attached Automatic Traffic Counter (ATC) data for the locations requested. The data has been extracted via our Patched ATC Database and is broken down by direction, by day, by hour. The data for each site provides you with the ATC Id, Road name and site location via Easting and Northing grid coordinates.


As mentioned above the data supplied has been extracted via the Patched ATC database which means that any gaps that are within the dataset (due to system failure, physical site damage etc.) are patched with a relevant substitution value, therefore making it possible to provide a continuous data set from the date of installation.


The Patched field within the dataset indicates if patching has taken place for a given flow value. If there is no value in this column, the data has not been patched. The values in this field correspond to the three patching types in the ATC patching process:

Patch Type 1: A single occurrence of 5 minutes missing, patched by interpolation using the values of the five minute periods before and after.

Patch Type 2: More than 6 ‘5-minute’ values missing within an hour thus deemed to be no value for the hour, whole hour is patched using substitution value.

Patch Type 3: Difference between recorded value and substitution value exceeds threshold (flows are 75% below what we would normally expect ) so patched using substitution value.


The Marylebone counter is a dual directional counter and therefore provides data for both East and West directions, which are shown within the dataset. Unfortunately vehicle classification is not captured within the ATCs and so can only provide vehicle flows.


I have provided you with vehicle data flows from the date of installation of the ATCs through to the latest dataset we have, which in this instance, is the 31/05/2017.


In addition to the above, the following is a link to the DfTs website, whereby Annual Average Daily Flows (AADF) datasets can be extracted for the location required via an interactive map and tables:


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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