Request ID: FOI-2372-2223 Date published: 09 January 2023
You asked
Hi there, please provide TFL Scoot data - both the congestion % and flow count for the following junctions between 7-10am
- Croxted Road Northbound at the junction with Norwood Road
- Turney Road Eastbound at the junction with Croxted Road
Period: 6th september 2021 to current period if possible
Thank you
We answered
TfL Ref: FOI-2372-2223
Thank you for your request received by Transport for London (TfL) on 20th December 2022 asking for Scoot data for Croxted Road and Turney Road. Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy.
Specifically you asked:
“Hi there, please provide TFL Scoot data - both the congestion % and flow count for the following junctions between 7-10am
- Croxted Road Northbound at the junction with Norwood Road
- Turney Road Eastbound at the junction with Croxted Road
Period: 6th september 2021 to current period if possible”.
I can confirm that we hold the information you require, which is provided in the attached spreadsheet (you may need to expand the width of some columns to read the information in full). Please note the following 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 within a 24 hour period 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 also note that SCOOT Flow data may differ from other validated counts as the SCOOT system utilises ‘loop occupancy’ as it primary source of data, which is then modelled into a flow count via an average occupancy per vehicle. This is often sensitive to over or under saturation - for example, when vehicles are sat over the detector for long period of time such as in congestion when queuing at traffic lights. The detectors are often sited at a distance from the junction where this is minimised, but sometimes - 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, and 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 recorded and we are not able to validate it.
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
