Decades of research prove that highways tear apart the physical fabric of our cities, segregating neighborhoods by race and income and making it harder for anyone outside a car to access the jobs, services and communities they rely on — at least if those things happen to be located on the other side of a dangerous road.

But what impact do highways have on the invisible social fabric of our places — and does the internet provide a bridge between these disconnected communities, or only a digital mirror of the sharp divides that highways draw between our neighborhoods? Today on the Brake, we're talking to data science researcher Luca Maria Aiello from IT University of Copenhagen, who found a fascinating way to quantify exactly how much downtown highways disconnect our social networks, in addition to our sidewalk, bike lane and transit networks. And along the way, we discuss what those divisions cost us in social mobility, democratic cohesion, and real dollars and cents.