What if, instead of devising ways to deter kids from using public space, cities were built to encourage it? That’s a question that city officials, planners, and NGOs are thinking about. Designing cities with young people in mind—particularly outdoor spaces that encourage safe movement and social interaction—stands to be an issue of growing concern globally. By 2050 around 70 percent of people will be urbanites, and the majority of them will be under 18. Today, over a billion children are growing up in cities.

Not only will better design help these children thrive and become healthier, more successful adults, but planning for children, with their more limited range and unhurried pace, means simultaneously planning for other vulnerable groups, such as the disabled and the elderly. And the well-being of children can have a way of uniting policymakers who disagree on most everything else.

So what does designing a city around kids mean? The Arup report’s authors are clear that it’s not just about building more playgrounds, however important such spaces are and will continue to be. The report focuses on two main aspects of design: everyday freedoms and children’s infrastructure.

Strategies for how to ensure such child-friendly design focus on walkability and decreasing the dominance of the automobile. The authors recommend interventions like wider sidewalks and protected cycle lanes and footbridges, and point to examples such as Barcelona’s “superblocks”—square sections of the city where cars are only permitted on perimeter roads, leaving large chunks of space free for pedestrians and cyclists.

The report also advocates for more parks, such as Bicentennial Children’s Park in Santiago, Chile, which spans the city and provides a continuous, green walkway and play space through neighborhoods rich and poor. “Wild spaces,” where children can play in nature, are also touted. Rotterdam, for instance, offers a forested area in one of its city parks where children can make dens, fires, and rafts—and even camp out overnight.

Splashy downtown megaprojects are typically less meaningful amenities for urban families. “When we create big parks and the big museum in the middle of a city, only certain kids use it,” said Michael Feigelson, executive director of the Bernard van Leer Foundation, which develops and shares knowledge about early childhood development. “But if we build smaller and more locally, all neighborhoods benefit.”

Arup’s report looks mainly at the kid-friendliness of cities in the developed world; child-friendly design can be even harder to accomplish in lower-income countries, where urbanization is occurring very rapidly and in an unplanned manner. “People often think of urbanization in the developing world as very dense, with slums and the like, but low-rise sprawl is even more of a problem,” said Jens Aerts, an urban planning expert at UNICEF.  “Cities in sub-Saharan Africa, for example, are often less compact, and it’s harder to adjust these urban environments to be more child responsive.”

The report recommends that children and families be included in urban planning processes, and Aerts noted that this is particularly critical in lower-income countries. “It’s about creating community life and interaction,” he said. “This means policies like defining shared spaces for children and families and regulating land use, infrastructure standards, and decision making so that’s possible.”

Is the plan put forth by Arup enough? Brent Toderian, former chief planner of Vancouver and advocate for making downtowns conducive to family life, has one criticism: a lack of attention given to housing and services. While any smart addition to the narrative of designing for families is positive, he said, the report’s focus on the public realm skips over the need for housing that fits families at many price points, and essential supports such as daycare and schools. “If you do everything in the report but you don’t have enough housing and support services, your success will be limited,” he said. “Good strategies address all three elements.”

While Jerome Frost of Arup agrees that housing and services are a necessity, he countered that first investing in the public realm means ultimately investing in the larger vision Toderian describes. The initial investment, he said, “creates value that can be captured and recycled to help fund the affordable housing and public services that underpin successful urban childhoods.”