London Taxis – changes in release 20Route Methodology Committee

Ipsos Connect Measurement

Sept 2016

2

What has changed in R20

4,000 new frames in the frame database

New Frame type – Digital Fins

Some frame ID’s have changed characteristics

New HERE 2015 infrastructure

New TIM 4.2 vehicle and pedestrian counts

Digital Fin Frames

Dimension codes, disc widths

Dimension

code Frame type Width (m) Height (m) Area (m2) Disc width (m)

19 TX TS (SuperSide) – taxi side 3.49 0.66 2.30 1.71

19 Vito TS (SuperSide) – taxi side 3.47 0.72 2.50 1.78

21 TX TW (Livery) - taxi side 3.49 0.66 2.30

3.32

21 TX TW (Livery) - taxi front/back 3.49 0.58 2.02

23 TX_Fin 0.93 0.22 0.20 0.51

4

Average visibility

Taxi Superside Livery Fin

Vehicles - same direction

Moving 0.4025 0.9546 0.1051

Stationary 0.1081 0.2137 0.0203

Vehicles - opposite

direction

Moving 0.0689 0.0689 0.0160

Stationary 0.1392 0.1392 0.0203

Pedestrians

Moving 0.0992 0.1306 0.0224

Stationary 0.7214 0.8607 0.1800

5

Visibility calculated for 43 different road type classifications that

determine taxi and vehicle/ pedestrian speed

Number of frames in R18 and R20

Taxi area TS_superside

TS_Vito

superside TW_Livery Total

Green 1327 22 930 2279

Heathrow 147 17 273 437

Yellow 260 4 191 455

Grand Total 1734 43 1394 3171

Taxi type TS_superside

TS_Vito

superside TW_Livery TW_Fin Total

Green 2630 58 1513 195 4396

Heathrow 175 19 253 447

Yellow 1695 9 438 3 2145

Total 4500 86 2204 198 6988

6

R18 Frames

R20 Frames

File 1 audience change – R20 versus R18

Release 20 Release 18 Change

Area Frame type Frames Vehicles Pedestrians Vehicles Pedestrians Vehicles Pedestrians

Green

(Central)

Side 2630 4960 33803 5083 34507 -2.4% -2.0%

Livery 1513 9201 44234 9430 45155 -2.4% -2.0%

Fin 195 1026 8034

Heathrow

Side 175 5818 35550 5819 34951 0.0% 1.7%

Livery 253 11163 46011 11165 45237 0.0% 1.7%

Fin 0 1205 8449

Yellow

(Outer)

Side 1695 2498 10052 2587 9949 -3.4% 1.0%

Livery 438 5422 13008 5616 12877 -3.5% 1.0%

Fin 3 517 2389

7

File 7 has been created for the first time as the Fin frames are all digital

File 4 had a lot of changes in R20

A number of changes to the standard methodology have an impact on the file 4 outputs

New HERE 2015 outputs means all road links have changed for travel survey respondents. Generally there is

an increase of around 10% on the number of road links. However the overall distance covered by these links

has not changed so the overall average length of each link has reduced. The average time on each link is also

reduced.

We have more than double the number of taxis/ frames on R20. This has meant we have had to recalibrate the

creation of the probability model output to be in line with population. A high proportion of respondents

travelling in London are assigned actual contacts with taxis. This is reasonable as there are a large number of

taxis with frames with advertising.

8

File 4 had a lot of changes in R20

It does place a challenge on the creation of the probability model which works on links in isolation and uses

individual link characteristics as well as TIM counts to assign a probability of a contact with a taxi.

We have attempted to replicate as close a match as possible with the probability model creation and

subsequent file 4 outputs.

We have also improved the way that visibility works on the file 4 output. On releases prior to R20, we were not

discriminating between side and livery frames in the file 4 output. With the inclusion of the much smaller

Digital Fin Frames we wanted to provide this discrimination in the outputs for these frames so it made sense

to extend the programming to discriminate side and livery frames in the same way

9

File 4 summary outputs by frame type – R20

Actual contacts Virtual contacts

Frames

Records/

frame

Average

probability

Average

visibility

Records/

frame

Average

probability

Average

visibility

Superside 1 4500 81 0.644 0.207 174 0.143 0.207

Superside 2 86 124 0.691 0.236 251 0.148 0.236

Livery 2204 105 0.668 0.333 210 0.147 0.333

Fin Digital 198 108 0.699 0.054 189 0.153 0.054

Total 6988 90 0.653 0.242 187 0.145 0.242

10

Toads analysis by Frame type – Reach – 100 Frames

11

Taxi R20 _ Reach %

Weeks Superside Livery Top

1 2.63 4.44 0.48

2 4.06 6.20 0.88

3 5.06 7.30 1.23

4 5.83 8.10 1.54

8 7.78 9.98 2.52

13 9.17 11.20 3.42

26 11.00 12.80 4.94

52 12.60 14.10 6.640

2

4

6

8

10

12

14

16

0 10 20 30 40 50 60

Reach % by Time by Dimension Code

Superside

Livery

Top

Toads analysis by frame type – frequency – 100 Frames

Taxi R20 _ Average Frequency

Weeks Superside Livery Top

1 1.59 1.55 0.91

2 2.06 2.22 0.99

3 2.48 2.83 1.07

4 2.87 3.41 1.13

8 4.30 5.53 1.38

13 5.93 7.99 1.66

26 9.86 14.00 2.30

52 17.20 25.40 3.41

12

0

5

10

15

20

25

30

1 2 3 4 8 13 26 52

Average Frequency by Dim

Superside

Livery

Top

For more information

www.ipsos-mori.com/ipsosconnect

Neil Farrer

Head of Measurement

0208 861 8149

07816 930380

neil.farrer@ipsos.com