A trip back to Sheffield, Alabama, is filled with reminders that boundaries aren't just physical.

Throughout this week, CityLab is running a series on borders—both real and imagined—and what draws so many of us to places on the edge.

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  1. Passengers line up for a bullet train at a platform in Tokyo Station.
    Transportation

    The Amazing Psychology of Japanese Train Stations

    The nation’s famed mastery of rail travel has been aided by some subtle behavioral tricks.

  2. Transportation

    Madrid Takes Its Car Ban to the Next Level

    Starting in November, the city will make clear that downtown streets are not for drivers.

  3. An interior view of operator Rafaela Vasquez moments before an Uber SUV hit a woman in Tempe, Arizona, in March 2018.
    Transportation

    Behind the Uber Self-Driving Car Crash: a Failure to Communicate

    The preliminary findings into a fatal crash in Tempe by the National Transportation Safety Board highlight the serious “handoff problem” in vehicle automation.

  4. POV

    What Surfers Understand About Gentrification

    When it comes to waves, newcomers are not wanted.

  5. Solutions

    Are ‘Pee Beds’ a Fix for Public Urination?

    In an effort to clean up popular sites of outdoor urination, researchers studied the mind of the man who pees in public. Their work could make stadiums and festival grounds smell a lot fresher in the future.