As I was going through the new London Plan yesterday I noticed a number of references to PTAL. I didn’t know what this was, so I obviously had to look it up.
It stands for Public Transit Accessibility Level. It’s a methodology that was developed in London in the 90′s. And it’s a measure of access to public transit, or of the density of the public transport network at any given location.
There are 6 levels, though two of the levels are further subdivided into 2 sub-levels for greater precision:
As I was going through the new London Plan yesterday I noticed a number of references to PTAL. I didn’t know what this was, so I obviously had to look it up.
It stands for Public Transit Accessibility Level. It’s a methodology that was developed in London in the 90′s. And it’s a measure of access to public transit, or of the density of the public transport network at any given location.
There are 6 levels, though two of the levels are further subdivided into 2 sub-levels for greater precision:
1a and 1b
2
3
4
5
6a and 6b
1 is bad. 6 is good.
What’s captured in this measure are the walking times from a particular location to the nearest transit access points; the reliability of the available services; the number of services available; and the average wait times.
Historically, this measure has helped to determine how much density could be built on a particular site, how much parking should be provided, and so on.
For example, in the new London Plan, PTAL 5 and 6, as well as Inner London PTAL 4, are expected to see development with no residential parking. Once you move to PTAL 3, the parking maximum moves up to 0.25 spaces per unit.
In the draft London Plan you’re also supposed to use the highest existing or planned PTAL. So if transit improvements are planned for the area, you factor those into the calculation.
Seems quite rationale (though it’s probably not a perfect measure of access and connectivity).
If you’d like to determine the PTAL for a particular address in Greater London, you can do that here. Unfortunately, I don’t have a calculator for you if you happen to live outside of London. But there is one simple check you can do.
The PTAL methodology assumes an average walking speed of 4.8 kph. The maximum allowable walk time for buses is 8 minutes and the maximum walk time for subway and light rail is 12 minutes. These numbers translate into distances of 640m and 960m, respectively.
How far do you have to walk to access good transit?
What’s captured in this measure are the walking times from a particular location to the nearest transit access points; the reliability of the available services; the number of services available; and the average wait times.
Historically, this measure has helped to determine how much density could be built on a particular site, how much parking should be provided, and so on.
For example, in the new London Plan, PTAL 5 and 6, as well as Inner London PTAL 4, are expected to see development with no residential parking. Once you move to PTAL 3, the parking maximum moves up to 0.25 spaces per unit.
In the draft London Plan you’re also supposed to use the highest existing or planned PTAL. So if transit improvements are planned for the area, you factor those into the calculation.
Seems quite rationale (though it’s probably not a perfect measure of access and connectivity).
If you’d like to determine the PTAL for a particular address in Greater London, you can do that here. Unfortunately, I don’t have a calculator for you if you happen to live outside of London. But there is one simple check you can do.
The PTAL methodology assumes an average walking speed of 4.8 kph. The maximum allowable walk time for buses is 8 minutes and the maximum walk time for subway and light rail is 12 minutes. These numbers translate into distances of 640m and 960m, respectively.
How far do you have to walk to access good transit?
A draft version of the new London Plan was released today for public consultation. It is “the spatial development strategy for Greater London”. And you can download all 524 pages of it, here. A final copy of the Plan is expected to be published by fall 2019.
“I am using all of the powers at my disposal to tackle the housing crisis head on, removing ineffective constraints on homebuilders so we make the most of precious land in our capital.”
And that tone comes through in the document. Here is an excerpt from the “optimising housing density” policy section:
“For London to accommodate growth in an inclusive and responsible way every new development needs to make the most efficient use of land. This will mean developing at densities above those of the surrounding area on most sites. The design of the development must optimise housing density.” (Section 3.6.1)
The Plan also contains a set of clear performance indicators. They cover things like the supply of new homes, the supply of affordable homes, modal share in the capital, and so on.
The ambition is 66,000 net additional homes each year. And by 2041, the goal is that 80% of all trips in London will be by foot, cycle, or public transport. There simply isn’t road the capacity.
Which is why the plan also specifies parking maximums, as opposed to parking minimums. The Plan wants the starting point for any development that is well-connected to transit – or to future transit – to be “car-free”.
If you have a chance, the new London Plan is worth a scan. Maybe you don’t want to print it though.
A draft version of the new London Plan was released today for public consultation. It is “the spatial development strategy for Greater London”. And you can download all 524 pages of it, here. A final copy of the Plan is expected to be published by fall 2019.
“I am using all of the powers at my disposal to tackle the housing crisis head on, removing ineffective constraints on homebuilders so we make the most of precious land in our capital.”
And that tone comes through in the document. Here is an excerpt from the “optimising housing density” policy section:
“For London to accommodate growth in an inclusive and responsible way every new development needs to make the most efficient use of land. This will mean developing at densities above those of the surrounding area on most sites. The design of the development must optimise housing density.” (Section 3.6.1)
The Plan also contains a set of clear performance indicators. They cover things like the supply of new homes, the supply of affordable homes, modal share in the capital, and so on.
The ambition is 66,000 net additional homes each year. And by 2041, the goal is that 80% of all trips in London will be by foot, cycle, or public transport. There simply isn’t road the capacity.
Which is why the plan also specifies parking maximums, as opposed to parking minimums. The Plan wants the starting point for any development that is well-connected to transit – or to future transit – to be “car-free”.
If you have a chance, the new London Plan is worth a scan. Maybe you don’t want to print it though.
