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Freeway construction is very much on the minds of many Arizonans. ADOT said the South Mountain Freeway should be finished late next year while advocates continue to push for the proposed Interstate 11, which would connect Phoenix to Las Vegas.

But, in a new book, a researcher from Stanford looks at the original interstate highway system, and how it affected American cities and politics.

Clayton Nall is an assistant professor in the Political Science Department at Stanford, and author of the book "The Road to Inequality: How the Federal Highway Program Polarized America and Undermined Cities."