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Hypothetical Data |
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| The following is hypothetical data for a particular car: |
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| Date |
Time |
Street |
Town |
Postcode |
Road number |
| Friday, 01 July 2005 |
08:12 |
127 High Street |
Beckenham |
BR3 1AG |
A234 |
| Friday, 01 July 2005 |
08:20 |
142 High Street |
Penge |
SE20 7EU |
A234 |
| Friday, 01 July 2005 |
08:29 |
97 Lordship Lane |
London |
SE22 8HU |
A2216 |
| Friday, 01 July 2005 |
08:34 |
37 Denmark Hill |
London |
SE5 8RS |
A215 |
| Friday, 01 July 2005 |
08:41 |
10 Walworth Road |
London |
SE1 6SP |
A215 |
| Friday, 01 July 2005 |
09:15 |
74 Blackfriars Road |
London |
SE1 8HA |
A201 |
| Friday, 01 July 2005 |
09:16 |
33 Belmont Road |
Liverpool |
L6 5BG |
A5089 |
| Friday, 01 July 2005 |
09:25 |
167 Fleet Street |
London |
EC4A 2JB |
A4 |
| Friday, 01 July 2005 |
09:29 |
105 The Strand |
London |
WC2R 0AA |
A4 |
| Friday, 01 July 2005 |
09:32 |
5 Trafalgar Square |
London |
SW1Y 5BJ |
A4 |
| Friday, 01 July 2005 |
18:32 |
5 Trafalgar Square |
London |
SW1Y 5BJ |
A4 |
| Friday, 01 July 2005 |
18:36 |
105 The Strand |
London |
WC2R 0AA |
A4 |
| Friday, 01 July 2005 |
18:45 |
167 Fleet Street |
London |
EC4A 2JB |
A4 |
| Friday, 01 July 2005 |
18:55 |
74 Blackfriars Road |
London |
SE1 8HA |
A201 |
| Friday, 01 July 2005 |
19:14 |
10 Walworth Road |
London |
SE1 6SP |
A215 |
| Friday, 01 July 2005 |
19:24 |
37 Denmark Hill |
London |
SE5 8RS |
A215 |
| Friday, 01 July 2005 |
19:29 |
97 Lordship Lane |
London |
SE22 8HU |
A2216 |
| Friday, 01 July 2005 |
19:35 |
142 High Street |
Penge |
SE20 7EU |
A234 |
| Friday, 01 July 2005 |
19:49 |
127 High Street |
Beckenham |
BR3 1AG |
A234 |
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| Above is a snapshot of the data-points for a certain car for the the 1st
July 2005. A person who is knowledgeable of London and its suburbs would
be able to state the following with absolute certainty: |
- The data point for Liverpool (at 09:16) is incorrect and should be
discarded.
- The car started travelling into London shortly before 08:12
- The car was either held up or parked for a short while at around 08:45
- The car commenced a return journey just before 18:32 and arrived at
its destination shortly after 19:49
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| Clearly, a similar interpretation of the data can be made by a computer
program and this driver can be billed for 2 trips during peak periods. |
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| The proportion of the bill for this driver can be divided between each
of the providers of correct data. On the other hand, the provider of the
incorrect (Liverpool) data can be penalized for the error. |
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| Clearly, the more data is collected, the greater the accuracy of the resulting
road-pricing calculation. However, Pareto's Principle (the 80-20 Rule) applies
in traffic like in so many other areas - 20% of cars create 80% of the congestion.
It is believed that the whole of the UK can be adequately monitored for
with only 10,000 cameras - one per 3,100 vehicles. |
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