FOI request detail


Request ID: FOI-1013-1718
Date published: 24 August 2017

You asked

I need urgently a copy of the micro-simulation video. As I mentioned last Thursday, I want to work on this before the RUF meeting this Wednesday 26-7-17. As I have asked at the two drop-in sessions, I should like to see traffic data and journey time predictions as below. I am surprised there was so little data available at the public events.Do you have origin / destination data for this group of junctions? I am interested in CURRENT traffic volume data by 15 minute segment across the day and week. Presumably you do have this data for each road coming into the junction group? Purley Way N Croydon Road MacDonalds site Morrisons site Stafford Road W Purley Way S Denning Avenue Duppas Hill Epsom Road N Can you kindly provide this data, preferably in an XLS file? You have published limited journey time data. You have not published a map showing the journey time marker points. Can you make this available please? There are 3 sets of data. CURRENT journey data - I understand obtained by a set of actual measurements through the area. I was told 10 and then 15-20 at the exhibition - how many is it? 2031 PREDICTED journey data - WITH CURRENT LAYOUT 2031 PREDICTED journey data - WITH NEW LAYOUT I assume you must have this data for buses and for cars between each of the main roads, and hopefully also for the two shopping sites? When you say "traffic", do you mean cars, or cars, vans and lorries, including HGV? Why is there no data on cycle journey times through the area? Why do you quote pedestrian crossing times for separate roads, rather than walk times between origin and destination points? Can you kindly provide a group of XLS tables showing the journey times for buses and for traffic for each of the 3 above cases for these time periods - or similar if these precise ones are not available - state times given? MON-FRI am peak mid day pm peak late evening (after 10pm) SAT and SUN around 0700 mid day around 1700 The tables should show journey times between the 9 groups of roads above, including the U-turn reverse direction manouvre, ie coming in from each road and using the current gyratory to go back along that same road.

We answered

TfL Ref: 1013-1718

Thank you for your request received by Transport for London (TfL) on 24 July 2017 asking for information about the A23 / A232 Waddon Fiveways scheme. I apologise for the delay in replying.

Your request has been considered in accordance with the terms of the Environmental Information Regulations (EIRs) and our information access policy.  I can confirm that we hold some of the information you require.

A CD of the VISSIM micro-simulation modelling for the Croydon Fiveways Scheme has now been issued to you in the post alongside the response from the consultation team to those parts of your enquiry which fall outside of Freedom of Information (FOI).

Please note that all modelling undertaken by TfL complies to WebTAG standards as set out by the DfT. More information can be found at Traffic models are predictive tools used to better help plan, design and operate the transport network. Models are designed as simplifications of the real world, at a particular moment in time, averaged over an observed period and are used to evaluate the impact, both positive and negative, of future network interventions.

The strategic modelling for the proposals utilises the Operational Network Evaluator (ONE) model which is built in the VISSUM software platform, created and maintained by TfL.

Strategic reassignment modelling provides information on the likely redistribution of trips through the network following the implementation of a scheme. The results are representative of network conditions sometime after the changes have been implemented, when individuals have learned of alternative routes and chosen the one best suited to them. The results produced from this modelling are only ever indicative and is intended to give an idea of where the impacts of changes in journey are likely to occur on the network. It assumes that all drivers have perfect knowledge of the network and will always choose the quickest route available.

Please also see attached copies of the two on street traffic surveys carried out for the Fiveways Junction. These contain the traffic volume data and the data for buses and cars.

Please note that in accordance with TfL’s obligations under the Data Protection Act 1998 (DPA) some personal data has been withheld, as required by section 40(2) of the FOI Act. This is because disclosure of this personal data would be a breach of the DPA, specifically the first principle of the DPA which requires all processing of personal data to be fair and lawful. It would not be fair to disclose this personal information when the individuals have no expectation it would be disclosed and TfL has not satisfied one of the conditions of Schedule 2 of the Data Protection Act which would make the processing ‘fair’.

We do not have a map as you requested for the journey time marker points.

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


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