Why Saudi Arabia’s “The Line” is not a revolution in urban living

Nine million people are expected to live in The Line, more than in any other city in Saudi Arabia (Render courtesy of Neom)
What some consider an ideal ecological city, others call a promotional gimmick. Researchers from the Complexity Science Hub now show why The Line should not be a showcase for future cities.

In October, the excavation work for the superlative construction project began.

“It’s the embodiment of the dream to start from scratch and completely rethink a city,” says Rafael Prieto-Curiel, who researches cities at the Complexity Science Hub. The Line is planned to be a city built from nothing in the desert.

It is to consist of two gigantic, unbroken rows of skyscrapers, with living space in between. It is planned to be 170km long, 200m wide, and 500m high, taller than any building in Europe, Africa, and Latin America.

10 times denser than Manhattan

Nine million people are expected to live in it, more than in any other city in Saudi Arabia.

This translates into a population density of 265,000 people per sq km: 10 times denser than Manhattan and four times denser than the inner districts of Manila, currently estimated to be the densest urban neighbourhoods on Earth.

At 500m in height, The Line would be taller than any building in Europe, Africa, and Latin America (Graphic courtesy of the Complexity Science Hub Vienna)

“How you can attract that many people in a medium-sized country at all is yet to be observed,” Prieto-Curiel points out.

60 minutes for a trip

Further questions arise in terms of mobility.

“A line is the least efficient possible shape of a city,” says Prieto-Curiel. “There’s a reason why humanity has 50,000 cities, and all of them are somehow round.”

If we randomly pick two people in The Line, they will be on average 57km apart. In Johannesburg, which is 50 times larger in area, two random people are only 33km apart.

Assuming a walking distance of one kilometre, only 1.2% of the population is within walking distance from each other. This hinders active mobility, so people will depend on public transport.

The backbone of public transportation is planned to be a high-speed rail system. “For everyone to be within walking distance of a station, there must be at least 86 stations,” says CSH researcher Dániel Kondor. As a result, trains spend considerable time in stations and will not be able to reach high travel speeds between any two stations.

According to the researchers, a trip, therefore, is expected to take 60 minutes on average, and at least 47% of the population would have an even longer commute.

What inside The Line might look like  (Render courtesy of Neom)

Even with additional express lines, gains are limited due to the additional transfers necessary. The result is that people would still be traveling longer than in other major cities, such as Seoul, where 25 million people commute for less than 50 minutes.

A city is more than a neighbourhood

Research shows that people want to spend a limited amount of time commuting, so successful cities need efficient transportation.

But can these trips through the city be avoided because high density allows everything (jobs, shopping, amenities, etc.) to be available locally?

“Cities are more than a collection of semi-isolated 15-minute neighbourhoods located next to each other,” says Kondor. “What sets a city apart from smaller settlements is not just its size but additional opportunities outside the immediate neighborhood such as concerts or an extended job search. For this reason, we need to consider citywide transportation.”

Why not ‘The Circle’?

If you take The Line and make it The Circle, with a radius of 3.3km, the distance between any two people would be only 2.9km, and 24% of the population would be within walking distance of each other.

Most mobility could be active (walking, cycling, or similar), making a high-speed rail system unnecessary.

Alternatively, The Circle could allow good connectivity even with lower densities, avoiding the need for supertall buildings.

Is there something positive?

“This project gets people discussing urban forms, and that’s immensely important because cities, especially in Africa, are growing,” says Prieto-Curiel.

Comparing city population sizes in Saudi Arabia, and rail stations needed to minimise commuting times (Graphic courtesy of the Complexity Science Hub Vienna)

Historically, cities often grew in organic ways, while planned cities often did not live up to expectations; thus, there is a need for more public engagement about urban design on a human scale.

Additionally, sustainability is emphasised in many aspects of the project. For example, there will be no cars for distances that are no more than a five-minute walk. This not only saves a lot of space in terms of infrastructure and parking but also reduces the number of cars.

Moreover, all energy will be produced with zero carbon emissions. What is not taken into account here, however, is the construction of the skyscrapers, which requires a lot of material and energy.

“Overall, it stands to reason that other considerations may have played a role in choosing this unique form, such as branding or creating engaging social media videos. However, it is important to understand the consequences, especially if The Line is treated as a showcase for modern building and urban planning technologies,” says Prieto-Curiel.

  • The Complexity Science Hub Vienna (CSH Vienna) is a joint initiative of AIT Austrian Institute of Technology, Central European University CEU, Danube University Krems, Graz University of Technology, Medical University of Vienna, TU Wien, VetMedUni Vienna, Vienna University of Economics and Business, and Austrian Economic Chambers (WKO). An extended paper on the topic by Rafael Prieto-Curiel and Dániel Kondor appeared this month in the journal Nature.

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  1. This is an excellent idea. I have been involved in the design of Smart Cities for many years all over Europe. But each quarter requires personality, otherwise it will be a sterile development. I watch with interest.

  2. I could not think of a worse way to spend a trillion dollars. Hey, but good luck!

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