bicyclist In 2016, 840 cyclists died in accidents involving motor vehicles, the most since 1991, according to the National Highway Traffic Safety Administration. (Photo: SeongJoon Cho/Bloomberg)

(Bloomberg) The next time you hop on a bicycle to head across town, consider this: your helmet may not perform well enough in an accident.

A first-of-its-kind study using the latest techniques for simulating head injuries found significant variations in how bike helmets protect against concussions.

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