Policing the Open Road

“From traffic stops to parking tickets, Seo traces the history of cars alongside the history of crime and discovers that the two are inextricably linked.”—Smithsonian

“With insights ranging from the joy of the open road to the indignities—and worse—of ‘driving while black,’ Sarah Seo makes the case that the ‘law of the car’ has eroded our rights to privacy and equal justice…Absorbing and so essential.”—Paul Butler, author of Chokehold

“A fascinating examination of how the automobile reconfigured American life, not just in terms of suburbanization and infrastructure but with regard to deeply ingrained notions of freedom and personal identity.”—Hua Hsu, New Yorker

When Americans think of freedom, they often picture the open road. Yet nowhere are we more likely to encounter the long arm of the law than in our cars. Sarah Seo reveals how the rise of the automobile led us to accept—and expect—pervasive police power. As Policing the Open Road makes clear, this radical transformation in the nature and meaning of American freedom has had far-reaching political and legal consequences.

Before the twentieth century, most Americans rarely came into contact with police officers. But with more and more drivers behind the wheel, police departments rapidly expanded their forces and increased officers’ authority to stop citizens who violated traffic laws. The Fourth Amendment—the constitutional protection against unreasonable searches and seizures—did not effectively shield individuals from government intrusion while driving. Instead, jurists interpreted the amendment narrowly. In a society dependent on cars, everyone—the law-breaking and law-abiding alike—would be subject to discretionary policing.

Seo overturns prevailing interpretations of the Warren Court’s due process revolution. The justices’ efforts to protect Americans did more to accommodate than to limit police intervention, and the new criminal procedures inadvertently sanctioned discrimination by officers of the law. Constitutional challenges to traffic stops largely failed, and motorists “driving while black” had little recourse to question police demands. Seo shows how procedures designed to safeguard us on the road ultimately undermined the nation’s commitment to equal protection before the law.