BUFFALO — The Scajaquada Corridor is a city dweller’s dreamland, a culture-vulture Valhalla. Within two miles there is a restored Frank Lloyd Wright house you can visit, an art museum with Picassos and Gauguins, three college campuses, a zoo and a history museum in a majestic Greek Revival building from the 1901 Pan Am Exposition listed on the National Historic Register. All of it borders a 356-acre park designed by Frederick Law Olmsted and Calvert Vaux.

There is just one problem: An expressway runs through it.

The Scajaquada Expressway, or Route 198, is a 3.2-mile tear in the urban fabric. Built in the early 1960s, it slices Delaware Park in half, isolates north Buffalo from destinations south, makes walking or bicycling in the area a death-courting activity and creates the strange optical illusions common to freewayscapes. The Albright-Knox Art Gallery and the Buffalo History Museum are less than half a mile apart, on opposite sides of the Scajaquada. Looking across the expanse of pavement and speeding traffic, however, the distance seems insurmountable.

“People don’t cross the Scajaquada,” said Alison Merner, the communications coordinator for GObike Buffalo, who grew up in a neighborhood that borders the expressway. “If I were going to go for a run or a short bike ride, I would always stay on my side. You were kind of on an island.”

The Scajaquada is not just a local barrier but also a poster road for a growing movement being championed by progressives in the urban-planning community. They want to tear down some highways in cities and replace all that elevated-and-barricaded pavement with lower-speed streets that favor pedestrians and bicyclists and foster greater connectivity among neighborhoods and residents.