With crash data, Boston tries to make bicycling safer

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Bike crashes in Boston are most likely to occur on Massachusetts Avenue, between 4 and 7 p.m., to men between the ages of 18 and 34 years old. And they are most often caused by cyclists running red lights.

Those insights are contained in a report of unprecedented scale that compiles years of data on bike collisions in the city. With a slew of statistics on crash locations and times, helmet use, and bicyclist and motorist behavior, the report, set to be released Wednesday, could prompt changes in how city officials strategize to ensure the safety of cyclists.

Mayor Thomas M. Menino, whose office commissioned the study, plans to announce a pledge to cut the cyclist crash injury rate by 50 percent by 2020.

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