FOI request detail

TFL Scoot data - congestion% and flow count

Request ID: FOI-2396-2223
Date published: 19 January 2023

You asked

Hi there, please provide TFL Scoot data - both the congestion % and flow count for the following junction between 7-10am. - Norwood Rd Northbound at the Herne Hill junction with Dulwich Road,Herne Hill Road, Milkwood Rd, Half Moon Lane.

We answered

Our ref: FOI-2396-2223/GH

Thank you for your request received by Transport for London (TfL) on 22 December 2022 asking for SCOOT data.

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 the scoot data around junction N09/029 - Norwood Rd Northbound at the Herne Hill junction with Dulwich Road,Herne Hill Road, Milkwood Rd, Half Moon Lane.  We have provided data from 1 January 2020 to date as you did not specify the dates you are interested in.

Please see explanation of what each column refers to within the spreadsheet:
  • SCOOTLinkID – Refers to the SCOOT Link ID
  • LinkDescription – A brief description of the location of the Link typically by road name
  • NodeDescription – A brief description of the Location of the Junction typically by road name
  • Latitude
  • Longitude
  • Date – The date of the data
  • VehicleFlowTotal – The total flow observed between 7 and 10 am across all links approaching the junction
  • FlowDataCompletenessPercentage – Refers to the availability of data; 100% is a complete dataset.
  • AverageCongestionPercentage – The average congestion within a 24 hour period across all links approaching the junction
  • CongestionDataCompletenessPercentage – Refers to the availability of data; 100% is a complete dataset

Please Note:

SCOOT Flow may differ from other validated counts as the SCOOT system utilises loop occupancy as it primary source of data, this is then modelled into a flow count via an average occupancy per vehicle. This is often sensitive to over or under saturation, e.g. when vehicles are sat over the detector for long period of time such as in congestion queuing at the lights. The detectors are often sited at a distance from the junction where this is minimised, but sometime especially when junctions are close together this issue is exaggerated. Therefore SCOOT Flow should be used more to generalise trend of demands and not actual counts.

SCOOT congestion is defined as the number of consecutive congested intervals in a cycle. It is expressed as a proportion of the cycle time.
(A congested interval is fully defined as: An interval where any detector on the link has a full interval (detector operated continuously over the four-second interval) and the back of queue is greater than half the maximum or, alternatively, where more than one detector has a full interval.)

The data provided here is given as is and we are not able to validate this data.

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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