New York City’s Brooklyn-Queens Expressway is falling apart. Built between 1946 and 1964, the urban highway runs 12.1 miles through the heart of the two boroughs to connect on either end with the interstate highway system—a relic of midcentury car-oriented infrastructure, and a prime example of the dwindling lifespan of roads built during that time.  The degradation is most visible—and most pressing—in a section running alongside Brooklyn Heights known as the triple cantilever. This 0.4-mile section, completed in 1954, is unique among U.S. highways in that it juts out from the side of a hill and stacks the two directions of traffic on balcony-like decks, one slightly overhanging the other. A third level holds a well-loved park, the Brooklyn Heights Promenade.  This unusual layer cake of a freeway was a marvel of engineering in its day, though not without controversy. Masterminded by Robert Moses, the city’s all-powerful, often ruthless city planner for more than four decades, the roadway bisects working-class and immigrant neighborhoods that grapple with the health and environmental fallout to this day. Like the reputation of the man who built it, the triple cantilever has aged poorly. Its narrow width, (33.5 feet for the roadway in either direction) has made all but the most basic maintenance incredibly difficult, and its 71-year-old structure is constantly battered by the ever heavier automobiles and trucks. Designed to accommodate around 47,000 vehicles per day, it now carries more than three times that amount. Deteriorating deck joints and failing steel-reinforced concrete have led many to worry the triple cantilever is on the verge of collapse. An expert panel warned in 2020 that the triple cantilever could be unusable by 2026. [Photo: Alex Potemkin/Getty Images] The mounting concern comes amid a 50-year decline in direct government spending on infrastructure in the U.S., according to a recent analysis by Citigroup. Simply maintaining existing infrastructure is a challenge, the report notes. Meanwhile, the American Society of Civil Engineers’ grade for the country’s infrastructure has improved, from a D+ in 2017 to a C in 2025. Now even private credit firms are circling: As reported in Bloomberg, Apollo Global Management estimates that a boom in infrastructure deals help could grow the private debt market up to a staggering $40 trillion.   Independent urban designer Marc Wouters has an idea on how to fix BQE’s cantilever. He’s been working on it for years. “My process is that I always interview people in the community before I do any drawings,” he says. “So I really have listened to pretty much everybody over the past few years.” Unsolicited and developed in his own spare time, Wouters has designed an alternative for the triple cantilever that he named the BQE Streamline Plan. BQE Streamline Plan [Image: courtesy Marc Wouters | Studios/©2025] His concept, based on decades of experience in urban planning, infrastructure, and resilience projects in communities across the country, is relatively simple: extend the width of the two traffic-bearing cantilevers and add support beams to their outside edge, move both directions of traffic onto four lanes on the first level, and turn the second level into a large freeway cap park. Instead of major rebuilding efforts, Wouters’s proposal is more of a reinforcement and expansion, with a High Line-style park plopped on top. Though he’s not an engineer, Wouters is confident that his design would shift enough strain off the existing structure to allow it to continue functioning for the foreseeable future. (What actual engineers think remains to be seen.) “What I’ve done is come up with a plan that happens to be much less invasive, faster to build, a lot cheaper, and it encompasses a lot of what the community wants,” he says. “Yet it still handles the same capacity as the highway does right now.” So what will it take for this outsider’s idea to be considered a viable design alternative? This idea had been brewing in his mind for years. Wouters, who lives near the triple cantilever section of the BQE in Brooklyn Heights, has followed the highway’s planning process for more than a decade.  As complex infrastructure projects go, this one is particularly convoluted. The BQE is overseen by both the state of New York and New York City, among others, with the city in charge of the 1.5-mile section that includes the triple cantilever. This dual ownership has complicated the management of the highway and its funding. The city and the state have launched several efforts over the years to reimagine the highway’s entire length. In winter 2018, the city’s Department of Transportation (NYC DOT) released two proposals to address the ailing cantilever. Not seeing what they wanted from either one, Brooklyn Heights Association, a nonprofit neighborhood group, retained Wouters and his studio to develop an alternative design. He suggested buil