If you’re a happy streetlight, and you know it… then sway all over the place and freak out English motorists. This video from the M62 motorway captured a rare natural phenomenon called “vortex shredding” that makes these lampposts look like they are dancing in the wind.
Vortex Shedding: Why The Streetlights Swayed In The Wind
What’s “vortex shredding” and why are the lamps swaying? When the natural frequency of a lamp column matches the speed of the wind, it’s called “vortex shedding.” It’s a very rare event and only happens at certain wind speeds.
Via Bobbles Hill