Left or Right? Why Do Countries Drive on Different Sides? | Smartest Year Ever (July 19, 2025)

Why do some countries drive on the left side of the road… while others drive on the right?

It’s one of those strange things we never think about—but it’s not based on engineering, safety, or modern logic. It goes back to knights, horses, class warfare, revolutions, and colonialism—and a few extremely dramatic moments in history that permanently altered the way people move through the world.

From ancient Roman chariots to the French Revolution, from Napoleon's conquests to a massive overnight road-switch called Dagen H, this episode peels back the pavement on one of the world’s weirdest cultural splits.

This is Episode 200 of the Smartest Year Ever. Buckle up—this one’s global.

Sources:

• Lethbridge, C. (2012). Driving on the Left or Right: Origins and Reasons. BBC. https://www.bbc.com/news/magazine-16245391
  

• McCarthy, T. (2015). Why Do the British Drive on the Left? The Guardian. https://www.theguardian.com/uk-news/shortcuts/2015/feb/16/why-do-the-british-drive-on-the-left
  

• Reid, C. (2015). Roads Were Not Built for Cars. Island Press.
  

• Swedish National Road Administration. (1967). Dagen H: The Changeover to Right-Hand Traffic in Sweden.
  

#DrivingHistory #RoadRules #GlobalCulture #SmartestYearEver #WorldFacts #DailyKnowledge

Music thanks to Zapsplat.