Here's the Physics Behind That Insane Chinese Traffic Jam

A few days ago, a drone captured this eye-popping video of the world’s worst traffic jam on the G4 Beijing-Hong Kong-Macau Expressway. Blame foggy weather if you like, but physics says it all comes down to a question of density — namely, an unusually high number of people returning to Beijing after a week-long holiday… »10/09/15 12:43pm10/09/15 12:43pm