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Definitions (45)
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access index
This index is one of the stages in calculating PTAL values. The full calculation method is described in our connectivity assessment guide
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accessibility
A station or a service is accessible if it is suitable for people with a range of needs, such as with wheelchairs or heavy shopping. In some places, the term accessibility is used to describe more gen [..]
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am peak
The hours in the morning when the transport system is very busy. We consider the three-hour period from 07:00 to 10:00 to represent the AM peak.
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areas for intensification
Areas identified in the London Plan as having high potential for the development of more homes and workplaces.
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base year
The year that represents the current state of the transport system. 2011 is used as the base year in WebCAT. We normally do not use the current year but a relatively recent year for which we have a su [..]
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between peak times
The time during a weekday when the transport system is less busy than in the peak. We consider the six-hour period from 10:00 to 16:00 to represent this period. This period is also sometimes called th [..]
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catchment
In WebCAT, a catchment area contains all the places that can be reached within a specified travel time from a specified place. We often calculate the population or number of workplaces within the catc [..]
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census
A very large survey where information is collected from all the people that live in the country. The last census in England was undertaken in 2011. Information from the census is used in various parts [..]
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census output areas
A set of boundaries that splits Greater London into 25,053 zones for the purpose of analysis.
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connectivity
If it is easy to travel to or from a place then it has a good level of connectivity. PTAL and TIM are two measures of connectivity.
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