Data for Blackfriars Junction person counts

The request was successful.

Dear Transport for London,

In the presentation to London Assembly on Tuesday 9 August (https://consultations.tfl.gov.uk/consult...) you show mode share of people using Blackfriars Junction in AM peak. Please provide the raw data used for the presentation, person counts for 2007/8 and estimates for 2012, as well as person counts for whole day for years 2007 through 2011 in xls or csv format.

Please also note how the data was collected as this is the first statistics I can recall counting people rather than vehicles.

Yours faithfully,

Tommi Komulainen

FOI, Transport for London

Dear Mr Komulainen

TfL Ref: FOI-0758-1112

Thank you for your e-mail received by Transport for London (TfL) on 8
September 2011 asking for information about pedestrian counts for
Blackfriars junction.

Your request will be processed in accordance with the requirements of the
Environmental Information Regulations and TfL's information access
policy.

A response will be provided to you by 6 October 2011.

In the meantime, if you would like to discuss this matter further, please
feel free to contact me.

Yours sincerely

Gemma Jacob

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

[1][TfL request email]

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FOI, Transport for London

3 Attachments

Dear Mr Komulainen

 

TfL Ref:          FOI-0758-1112

 

Thank you for your e-mail received by Transport for London (TfL) on 8
September 2011 asking for information about pedestrian counts for
Blackfriars junction.

 

Your request has been considered in accordance with the requirements of
the Environmental Information Regulations and TfL’s information access
policy.  I can confirm that TfL holds the information you require. You
asked for:

 

The raw data used for the presentation to the London Assembly on Tuesday 9
August
([1]https://consultations.tfl.gov.uk/consult...)
showing mode share of people using Blackfriars Junction in AM peak, person
counts for 2007/8 and estimates for 2012, as well as person counts for
whole day for years 2007 through 2011 in xls or csv format.

 

Please also note how the data was collected as this is the first
statistics I can recall counting people rather than vehicles.

 

Please find attached an excel spreadsheet containing the raw data and an
explanatory note detailing how the figures were calculated.

 

If this is not the information you are looking for, or if you are unable
to access it for some reason, please feel free to contact me.

 

Please see the attached information sheet for details of your right to
appeal.

 

Yours sincerely

 

Gemma Jacob

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

 

[2][TfL request email]

 

 

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Dear FOI,

The data you have provided does not appear to be consistent. The quarterly counts on "Surveys Data JMP 2007_Blackfrs" sheet do not seem to sum up (in any combinations) to match the northbound/southbound counts on "Traffic Counts 2007" sheet.

Please verify and explain how you have derived the summary counts from the survey data?

Please also explain why it took you one month to produce this information when it must've already been readily available in order to produce the original presentation?

Yours sincerely,

Tommi Komulainen

FOI, Transport for London

1 Attachment

Dear Mr Komulainen

 

TfL Ref:          FOI-0758-1112

 

Thank you for your further e-mail regarding your recent EIR request.

 

The counts were produced by totalling all the movements that were counted
that began and ended on Blackfriars Bridge rather than all movements
through the entire junction network. Therefore the count numbers used will
not equal the sum of all the movements detailed in “Surveys Data JMP
2007_Blackfrs" tab. The counts were also only used for 0730 to 0930 to
ensure the consistency between this set and our pedestrian counts. 

 

I have attach the explanatory note previously provided that gives a
briefing regarding the assumptions behind the pie charts that has been
members of the London Assembly.  We hope this may help to further your
understanding of the statistics we have provided.

 

We apologise that we were not able to provide you with the data used in
the presentation as promptly as you would had wanted. Please let me know
if you have any other queries that I can help you with.

 

Yours sincerely

 

Gemma Jacob

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

 

[1][TfL request email]

 

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Dear FOI,

As I said in my previous message there is no combination of individual counts that produce the summary figure. The summary Southbound 2007 "Total vehicle" counts between 07:30 - 09:30 are:

238 266 270 331 332 343 348 338

The sum of "Total" vehicle counts ending on Blackfriars Bridge for same time period are:

254 267 271 343 336 343 342 338

So my question still stands, but allow me to rephrase. What exact formula, i.e. which exact cells were added together, was used to derive the summary figures from the survey data?

Please also answer my earlier question why it takes you one month to produce data that must've been readily at hand at the time.

Yours sincerely,

Tommi Komulainen

FOI, Transport for London

Dear Mr Komulainen

 

TfL Ref:          FOI-0758-1112

 

Thank you for the further correspondence regarding the spreadsheet.

 

As you have noted there are some minor variations between the raw JMP
counts and the figures used in the Pie charts presented to the London
Assembly. I have presented the differences below, and the overall impact
on the data that was presented. The tables below show that the data
produced would only make one small adjustment to the pie chart percentage
totals – HGVs would reduce from 3% to 2% of all traffic in the AM peak. 

 

Raw
(JMP) Total    
Data Cars/LGVs HGVs Buses Cyclists Motorcycles Taxi/PHVs vehicles
NB 1238 89 55 826 589 637 3434  
SB 1237 142 68 221 196 630 2494  
Total 2475 231 123 1047 785 1267 5928  
% 41.8% 3.9% 2.1% 17.7% 13.2% 21.4%  
See  
Occupancy 1.63 1 below 1 1 1.8
Total
people  
carried by
mode 4034 231 1789 1047 785 2281 10167
 
% 40% 2% 18% 10% 8% 22%  
 
Data
provided
by TfL    
to
London Total
Assembly Cars/LGVs HGVs Buses Cyclists Motorcycles Taxi/PHVs vehicles
NB 1238 119 54 822 589 637 3459  
SB 1236 140 58 175 242 615 2466  
Total 2474 259 112 997 831 1252 5925  
% 41.8% 4.4% 1.9% 16.8% 14.0% 21.1%  
See  
Occupancy 1.63 1 below 1 1 1.8
Total
people  
carried by
mode 4033 259 1789 997 831 2254 10162
 
% 40% 3% 18% 10% 8% 22%  
 
%  
difference 0.0% 0.3% 0.0% -0.5% 0.5% -0.3%

Bus passenger data was compiled from the Bus Origin and Destination
survey.

 

The formulas used for copying this data from the original are not
available in any of our working files to clarify where any minor
formatting mistake may have occurred in the transcription of data. The
tables used were:

 

·         Queen Victoria Street .$B"*.(J Blackfriars Bridge

·         New Bridge Street .$B"*.(J Blackfriars Bridge

·         Blackfriars Bridge .$B"*.(J Victoria Embankment

·         Blackfriars Bridge .$B"*.(J New Bridge Street (North)

·         Blackfriars Bridge .$B"*.(J Queen Victoria Street

 

Data relevant to each mode between 0730 and 0930 was to be used, for
instance cells S11:S17 for cycles movements on New Bridge Street to
Blackfriars Bridge should have been totalled.

 

TfL has a statutory obligation to provide the information requested within
20 days. Whilst we endeavor to respond as quickly as possible it can take
time to process a request. I apologise again for any delays experienced
previously in the release of data. 

 

Yours sincerely

 

Gemma Jacob

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

 

[1][TfL request email]

 

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