London’s mayor wants to move major streets underground to make a pedestrian-friendly city

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[beforeafter]Current image of A408 Southgate  in London (Courtesy TfL)TfL-FlyUnders - A406 Southgate[/beforeafter]

In recent years, the proliferation of parks, pedestrian plazas, greenways, and bike share programs in cities around the world have signaled an important change in the culture of city-dwellers, one that values walkability, integrated and congestion-free neighborhoods, open space, and environmental health. The major thoroughfares, however, that slice through metropolises are not always conducive with this desired urban experience, and take up space that could otherwise be used for housing, office and commercial uses, and parkland. That’s why London Mayor Boris Johnson is proposing to relocate portions of key road networks underground. And where better to make this announcement than in and around Boston’s infamous “Big Dig” project?

TfL-Hammersmith (Courtesy TfL)

TfL-Hammersmith (Courtesy TfL)

“Rebuilding some of our complex and aging road network underneath our city would not only provide additional capacity for traffic, but it would also unlock surface space and reduce the impact of noise and pollution. I am inspired by what the ambitious people of Boston have achieved here at the Big Dig, both in terms of reducing congestion and how they have dramatically improved the quality of life on the surface. In London we face similar challenges on our roads, but this could also be a fantastic opportunity to better shape our city and support economic growth,” said Johnson in a statement.

[beforeafter]TfL-FlyUnders A13 BarkingCurrent image of A13 Barking (Courtesy TfL)[/beforeafter]

After taking a look at more than 70 locations around the city, the mayor identified five areas where “the introduction of tunnels, fly-unders and decking could deliver benefits that are in line with the Mayor’s 2050 Infrastructure Plan.” These areas include a mini tunnel at the A13 in Barking Riverside, decking of the A3 in Tolworth, a fly-under at the A316 at Chalkers Corner, a fly-under at the A4 in Hammersmith, and decking or a mini-tunnel at the A406 in New Southgate. In addition, the mayor says that London’s Inner Ring Road is “facing increasing pressure for change” and is ready to be replaced by a new inner orbital tunnel or two cross city tunnels to ease traffic.

[beforeafter]TfL Fly-under - A3 Tolworth (Courtesy TfL)Current image of A3 Tolworth (Courtesy TfL)[/beforeafter]

Beyond seeking a more livable city for Londoners, the plan is also designed to address and provide a solution for the city’s significant population growth, which is anticipated to reach 10 million by the early 2030s.

The “Big Dig” is a tenuous paradigm as the megaproject took 20 years to complete and was plagued with mounting costs, structural problems, criminal arrests, and a fatal accident. Even still, many have deemed it a success in terms of mitigating congestion, decreasing travel time and thus overall fuel costs, and freeing up land for a new greenway.

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