Request ID: FOI-1610-2223 Date published: 02 November 2022
You asked
Could you please provide the SCOOT data for the following location:
- junction: Lower Boston to Uxbridge Rd (from 2020 to now)
- junction: Hanger Lane to Uxbridge Rd (from 2020 to now).
Could you please provide the SCOOT data for the following location: - junction: Lower Boston to Uxbridge Rd (from 2020 to now) - junction: Hanger lane (A406) and Uxbridge Rd (from 2020 to now).
Please see attached as requested which contains all of the junctions between Uxbridge Road and Hanger Lane and Uxbridge Road and Lower Boston Road. Please expand the column widths to see the data where necessary.
Please see below for an explanation of what each column refers to within the data:
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
TwentyFourHourVehicleFlowTotal – 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 note the following data caveat:
SCOOT Flow may differ from other validated traffic counts as the SCOOT system utilises loop occupancy as its 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 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
Sara Thomas FOI Case Management Team General Counsel Transport for London
