Month: January 2024

Posted on

How do higher density and better quality of life go together? 3/7

A certain degree of compactness is essential for the viability of 15-minute cities.  This is due to the need for an economic threshold for facilities accessible by walking or cycling. A summary of 300 research projects by the OECD shows that compactness increases the efficiency of public services in all respects. But it also reveals disadvantages in terms of health and well-being due to pollution, traffic, and noise. The assumption is that there is an optimal density at which both pleasant living and the presence of everyday facilities – including schools – can be realised.  At this point, ‘densification’ is not at the expense of quality of life but contributes to it.  A lower density results in more car use and a higher density will reduce living and green space and the opportunity to create jobs.

The image above is a sketch of the ‘Plan Papenvest’ in Brussels. The density, 300 dwellings on an area of 1.13 hectares, is ten times that of an average neighbourhood. Urban planners often mention that the density of Dutch cities is much lower than in Paris and Barcelona, for example. Yet it is precisely in these cities that traffic is one of the main causes of air pollution, stress, and health problems. The benefits of compactness combined with a high quality of life can only be realised if the nuisances associated with increasing density are limited. This uncompromisingly means limiting car ownership and use.

Urban planners often seem to argue the other way round. They argue that building in the green areas around cities must be prevented at all costs to protect nature and that there is still enough space for building in the cities. The validity of this view is limited. In the first place, the scarce open space within cities can be better used for clean workshops and nature development in combination with water control. Secondly, much of the ‘green’ space outside cities is not valuable nature at all. Most of it is used to produce feed for livestock, especially cows. Using a few per cent of this space for housing does not harm nature at all. This housing must be concentrated near public transport. The worst idea is to add a road to the outskirts of every town and village. This will undoubtedly increase the use of cars.

HERE you can link to my free downloadable e-book: 25 Building blocks to create better streets, neighborhoods and cities 

Posted on

The 15-minute city: from metaphor to planning concept (2/7)

Carlos Moreno, a professor at the Sorbonne University, helped Mayor Anne Hidalgo develop the idea of the 15-minute city. He said that six things made people happy: living, working, amenities, education, wellbeing, and recreation. The quality of the urban environment is enhanced when these functions are realized near each other. The monofunctional expansion of cities in the US, but also in the bidonvilles of Paris, is a thorn in his side, partly because this justifies owning a car.

A more precise definition of the concept of the 15-minute city is needed before it can be implemented on a large scale. It is important to clarify which means of transport must be available to reach certain facilities in a given number of minutes. The list of facilities is usually very comprehensive, while the list of means of transport is usually only vaguely defined. But the distance you can travel in 15 minutes depends on the availability of certain modes of transport (see figure above).

Advocates of “new urbanism” have developed the tools to design 15-minute cities. They are based on three zones: the 5-minute walking zone, the 15-minute walking zone, which coincides with the 5-minute cycling zone, and finally the 15-minute cycling zone. These are not static concepts: In practice, the zones overlap and complement each other.

The 5-minute walking zone

This zone corresponds to the way in which most residential neighbourhoods functioned up until the 1960s, wherever you are in the world. Imagine a space with an average distance from the center to the edge of about 400 meters. In the center you will find a limited number of shops, a (small) supermarket, one or more cafes and a restaurant. The number of residents will vary between two and three thousand. Density will decrease from the centre and the main streets outwards. Green spaces, including a small neighbourhood park, will be distributed throughout the neighbourhood, as will workshops and offices.

In the case of new construction, it is essential that pedestrian areas have a dense network of paths without crossings at ground level with streets where car traffic is allowed. Some paths are wider and allow cycling within the 5- and 15-minute cycle zones. The streets provide access to concentrated parking facilities.

The 5-minute cycle zone and the 15-minute walking zone.

Here the distance from the center to the edge is about one kilometer. In this area, most of the facilities that residents need is available and can be distributed around the centers of the 5-minute walking zones. For example, a slightly larger supermarket may be located between two 5-minute walking zones. This zone will also contain one or more larger parks and some larger concentrations of employment.

This zone can be a large district of a city, but it can also be a small municipality or district of around 15 to 25,000 inhabitants. With such a population there will be little room for dogmatic design, especially when it comes to existing buildings. But even then, it is possible to separate traffic types by keeping cars off many streets and clustering car parks. The bottom line is that all destinations in this zone can be reached quickly by walking and cycling, and that car routes can be crossed safely.

The car will be used (occasionally) for several destinations. For example, for large shopping trips to the supermarket.

The 15-minute cycle zone.

This zone will be home to 100.00 or more residents. The large variation is due to the (accidental) presence of facilities for a larger catchment area, such as an industrial estate, a furniture boulevard or an IKEA, a university or a (regional) hospital. It is certainly not a sum of comparable 5-minute cycle zones. Nevertheless, the aim is to distribute functions over the whole area on as small a scale as possible. In practice, this zone is also crossed by several roads for car traffic. The network of cycle paths provides the most direct links between the 5-minute cycle zones and the wider area.

The main urban development objectives for this zone are good accessibility to urban facilities by public transport from all neighbourhoods, the prohibition of hypermarkets and a certain distribution of central functions throughout the area: Residents should be able to go out and have fun in a few places and not just in a central part of the city.

Below you can link to my free downloadable e-book: 25 Building blocks to create better streets, neighborhoods and cities

https://www.dropbox.com/scl/fi/e8ezk57ftn75hk4e9829g/Better-streets-neighbourhoods-and-cities.pdf?rlkey=ygapjch6dq75j5479shsg87z8&dl=0
Posted on

The 15-minute city: from vague memory to future reality (1/7)

Paris: La Ville du Quart d’Heure

Without changes to the transport system in which they operate, the advent of autonomous cars will not significantly improve the quality of life in our cities. This has been discussed in previous contributions. This change includes prioritizing investment in developing high-quality public transport and autonomous minibuses to cover the first and last mile.

However, this is not enough by itself. The need to reduce the distances we travel daily also applies to transporting raw materials and food around the world. This is the subject of a new series of blog posts, and probably the last.

Over the next few weeks I will be discussing the sustainability of the need for people and goods to travel long distances. In many cities, the corona pandemic has been a boost to this idea. Paris is used as an example. But what applies to Paris applies to every city.

When Anne Hidalgo took office as the newly elected mayor in 2016, her first actions were to close the motorway over the Seine quay and build kilometres of cycle paths. Initially, these actions were motivated by environmental concerns. Apparently, there was enough support for these plans to ensure her re-election in 2020. She had understood that measures to limit car traffic would not be enough. That is why she campaigned on the idea of “La Ville du Quart d’Heure”, the 15-minute city, also known as the “complete neighbourhood”. In essence, the idea is to provide citizens with almost all of their daily needs – employment, housing, amenities, schools, care and recreation – within a 15-minute walk or bike ride of their homes. The idea appealed. The idea of keeping people in their cars was replaced by the more sympathetic, empirical idea of making them redundant.

During pandemics, lockdowns prevent people from leaving their homes or travelling more than one kilometer. For the daily journey to work or school, the tele-works took their place, and the number of (temporary) “pistes á cycler” quickly increased. For many Parisians, the rediscovery of their own neighbourhood was a revelation. They looked up to the parks every day, the neighbourhood shops had more customers, commuters suddenly had much more time and, despite all the worries, the pandemic was in a revival of “village” coziness.

A revival, indeed, because until the 1960s, most of the inhabitants of the countries of Europe, the United States, Canada and Australia did not know that everything they needed on a daily basis was available within walking or cycling distance. It was against this backdrop that the idea of the 15-minute city gained ground in Paris.

We talk about a 15-minute city when neighbourhoods have the following characteristics

– a mix of housing for people of different ages and backgrounds – pedestrians and cyclists

– Pedestrians and cyclists, especially children, can safely use car-free streets.

– Shops within walking distance (up to 400 meters) for all daily needs

– The same goes for a medical center and a primary school.

– There are excellent public transport links;

– Parking is available on the outskirts of the neighbourhood.

– Several businesses and workshops are located in each neighbourhood.

– Neighbourhoods offer different types of meeting places, from parks to cafes and restaurants.

– There are many green and leafy streets in a neighbourhood.

– The population is large enough to support these facilities.

– Citizens have a degree of self-management.

Urban planners have rarely lost sight of these ideas. In many cities, the pandemic has made these vague memories accessible goals, even if they are far from reality.

In the next post, I will reflect on how the idea of the 15-minute city is moving from dream to reality.

HERE you can link to my free downloadable e-book: 25 Building blocks to create better streets, neighborhoods and cities