A bike messenger was fatally hit by a truck while riding in morning traffic in Manhattan. Three days later, another cyclist was struck and killed by a car in Brooklyn.

And four days after that — less than four miles from the last crash — still another cyclist died after being struck by a cement truck.

The shocking spate of three deaths in a little over a week has drawn anguished cries from cyclists and transportation advocates and has undercut Mayor Bill de Blasio’s signature transportation policy to make the streets safer.

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