Sorry, but actually it has been known about for many years!! When I was jungle training in Malaya in 1955 we knew better than to cross our rope bridge in rhythmic marching steps.

No, it’s not the quite the same thing.

In fact when I worked with one of the Arup Engineers who was on the Millenium Bridge design team, several years ago, I querried the exact same thing, as my Dad had always told me years ago about the ‘break step’ order when marching over bridges.